All accounting basics, latest first.
Variable cost ratio: the simplest number that tells you how strong your unit economics are
Variable cost ratio is total variable cost divided by total revenue, expressed as a percentage. It is the inverse of contribution margin %. The lower it is, the more dollars per sale your shop has left to cover fixed costs and become profit.
Ibrahim Ölmez
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25 May
Service mix: the salon metric that explains why a busy week can still be a low-margin week
Service mix is the share of revenue coming from each service category — and a 20-point shift between categories can move salon margin by 4-7 percentage points without a single price change.
Ibrahim Ölmez
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25 May
Sell-through rate: the 8-week test for whether a delivery is doing its job
Sell-through rate is units sold divided by units received, in the same window. A healthy boutique hits 70-80% within 8 weeks of a delivery. Below 50% means you bought too deep or priced too high — and the markdown clock has already started.
Ibrahim Ölmez
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25 May
Salon client retention rate: how to calculate it, the benchmarks, and what a low number actually tells you
Client retention rate is the single number that separates a salon with a business from a salon with a marketing addiction — and the benchmarks are tighter than most owners realise.
Ibrahim Ölmez
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25 May
Return on Ad Spend (ROAS): the definition, formula and why blended is more honest
ROAS tells you how many euros of revenue every euro of ad spend produced — but the platform-reported version is almost always overstated.
Ibrahim Ölmez
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25 May
Revenue per chair: the salon unit-economics metric that tells you if you have a real business
Revenue per chair is the cleanest single number for whether a salon is a real business or a hobby with overhead — and the benchmarks for mid-range vs premium are tighter than most owners think.
Ibrahim Ölmez
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25 May
Prime cost (restaurant): the one number that decides whether the kitchen is profitable
Prime cost is food plus beverage COGS plus total labour (kitchen and front-of-house, taxes and benefits included) divided by revenue. It is the single most important controllable cost in a restaurant — if it drifts above the band for your concept, no amount of marketing fixes the P&L.
Ibrahim Ölmez
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25 May
Payback period: how long until an investment pays for itself
Payback period is the number of months it takes for an investment — a new espresso machine, a hire, a marketing campaign — to return its own cost in additional contribution.
Ibrahim Ölmez
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25 May
Operating margin vs net margin: the two profitability numbers and which one to use when
Operating margin is EBIT divided by revenue — the operator's number, used to judge whether the shop itself is profitable. Net margin is net profit divided by revenue, after interest and tax — the owner's number, used to judge what actually ends up in your pocket.
Ibrahim Ölmez
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25 May
Operating expense ratio (OER): the percentage of every euro that goes to running the shop
Operating expense ratio is the share of revenue swallowed by operating costs — the cleanest single number to tell you whether your cost base is sized for the revenue you actually produce.
Ibrahim Ölmez
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25 May
Net margin: the bottom-line ratio that finally tells you what you kept
Net margin is the share of revenue that survives every cost — COGS, operating expenses, interest, tax — and ends up in your bank account. It is the only number that answers "did the business actually make money this year?"
Ibrahim Ölmez
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25 May
Markup vs margin: why a 50% markup is only a 33% margin (and why it matters)
Markup divides by cost. Margin divides by price. Same numerator, different denominator, two different numbers. A €10 item sold at €15 is a 50% markup and a 33% margin. Confusing the two is the most common pricing mistake in retail.
Ibrahim Ölmez
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25 May
Labour cost percentage (restaurant): the other half of prime cost, and the faster one to fix
Labour cost percentage is fully loaded labour (wages, payroll taxes, benefits) divided by net revenue. It is the half of prime cost you can move tomorrow with a single roster change — which is why operators who watch it daily run leaner than operators who learn about it at month-end.
Ibrahim Ölmez
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25 May
Inventory turnover ratio: the formula, the benchmarks and what 4 turns a year actually means for a small shop
Inventory turnover ratio is COGS divided by average inventory — the number of times you sold through your entire stock in a year. Most small boutiques sit at 3-5 turns. Below 3 means your money is sleeping on the shelf.
Ibrahim Ölmez
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25 May
Gross margin: the one ratio that tells you if your pricing is honest
Gross margin is what is left from each euro of revenue after the cost of what you sold — the cleanest signal you have on whether the price you charge actually covers what you pay.
Ibrahim Ölmez
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25 May
GMROI: the single number that tells you whether your inventory is earning its keep
GMROI is gross margin % multiplied by inventory turnover — euros of gross margin earned per euro tied up in stock. A high-margin slow shop and a low-margin fast shop can land at the same GMROI. That is the point.
Ibrahim Ölmez
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25 May
Food cost percentage: the most-tracked number in restaurants and what it actually tells you
Food cost percentage is food COGS divided by food revenue, expressed as a percentage. It is the most-tracked metric in restaurants because it moves daily, the levers are obvious, and a two-point drift is the difference between an EBIT-positive month and a break-even one.
Ibrahim Ölmez
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25 May
Fixed vs variable costs for small business: the definition, the examples, the traps
Every cost in your shop is either fixed or variable. Which one it is decides how it shows up in your daily P&L, where your break-even sits, and how every staffing, pricing and scaling decision lands. Most owners get the headline right and the edges wrong — and the edges are where the money quietly leaks. This is the plain-English explainer, with examples for cafe, retail, salon and e-commerce, the six traps that catch almost everyone, and how nouz handles each.
Ibrahim Ölmez
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25 May
Fixed cost coverage ratio: the one number that tells you if your shop is paying for itself
Fixed cost coverage ratio is total contribution margin divided by total fixed costs. A ratio of 1.0 means you are breaking even — every euro of fixed cost is covered exactly. Above 1.0 is profitable; below 1.0 is losing money.
Ibrahim Ölmez
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25 May
EBIT vs EBITDA: the difference in plain English (and which one a small-shop owner should track)
EBIT is operating profit before interest and tax. EBITDA is the same number with depreciation and amortisation added back — so it always looks bigger. For most small shops, EBIT is the honest number; EBITDA is what gets quoted when someone wants the figure to look healthier than it is.
Ibrahim Ölmez
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25 May
Days sales of inventory (DSI): the days-on-hand number that explains your cash cycle
DSI tells you the average number of days it takes to sell through your inventory. €18.000 of stock against €72.000 of annual COGS = 91 days on the shelf. The longer it sits, the longer your cash sits with it.
Ibrahim Ölmez
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25 May
Daily P&L for small business: the definitive guide for owner-operators who need to know if today paid for itself
Daily P&L is its own genre — distinct from the monthly accounts your accountant produces, distinct from the revenue dashboards your POS shows, distinct from the spreadsheet most owners abandoned in year two. It is the same-day operating profit number computed every evening from the day's real entries, and it is the single most useful instrument an owner-operator can have on their phone. This guide walks the entire territory: the formula, the worked examples, the diagnostic patterns, the verticals, the 30-day install plan — everything that makes daily P&L the daily ritual that quietly separates owners who build a business from owners who tread water in one.
Ibrahim Ölmez
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25 May
Cover count (restaurant): the headcount metric your transaction report is not telling you
A cover is one guest served, not one bill paid. A table of four is one transaction and four covers — and the difference is what tells you whether last night was busy or just expensive.
Ibrahim Ölmez
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25 May
Contribution margin explained: the dollars per sale that keep your shop alive
Contribution margin is revenue per unit minus variable cost per unit — the money left over from each sale to "contribute" toward covering your fixed costs. It is the denominator in every break-even calculation and the single most useful per-product number a small-shop owner can learn to read.
Ibrahim Ölmez
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25 May
COGS in ecommerce: what to include, what to exclude and the per-order calculation
COGS in ecommerce is the true cost of putting one order in a customer's hands — product, freight in, packaging, and per-order fulfillment. Ads and Shopify fees are not COGS.
Ibrahim Ölmez
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25 May
Customer Lifetime Value (CLV): the formula, worked example and the 3:1 rule
CLV is the total gross profit one customer generates over the whole time they buy from you — minus what you paid to acquire them.
Ibrahim Ölmez
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25 May
Chair utilization rate: what it is, how to calculate it, and the salon benchmarks that matter
Chair utilization rate tells you, in one percentage, how full your booking calendar actually is — and whether your next problem is pricing, marketing, or hiring.
Ibrahim Ölmez
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25 May
Cash runway: the number of months before the bank account hits zero
Cash runway tells you how many months of operation you have left at the current rate of cash burn — the single most important number when reserves are shrinking and revenue is not yet ahead of costs.
Ibrahim Ölmez
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25 May
Cash flow vs profit explained: why profitable shops go broke and unprofitable ones survive
Profit is what your business earned over a period. Cash flow is what landed in (and left) your bank account over the same period. They are not the same number, and they rarely move together. The most successful shop on your street can die from a cash crunch. The least profitable can stay open for years on great cash flow. Owners who do not understand the difference get blindsided — usually around month four.
Ibrahim Ölmez
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25 May
Customer Acquisition Cost (CAC): the honest definition, formula and worked example
CAC is what it actually costs you to win one new customer — and the honest version includes every euro you spent to get them, not just the ad spend.
Ibrahim Ölmez
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25 May
Burn rate: how fast a small shop is consuming its cash reserves
Burn rate is the net cash flowing out of the business each month — the speed at which your reserves shrink when costs are running ahead of revenue.
Ibrahim Ölmez
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25 May
Break-even point: the formula every small shop should know in one paragraph
The break-even point is the revenue (or unit count) at which total revenue exactly matches total costs — the point where your shop stops losing money for the day and starts earning it.
Ibrahim Ölmez
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25 May
Break-even analysis for small business: the formula, the worked examples, the daily number that defines survival
Most small-shop owners can quote their revenue. Almost none can quote their break-even point — the revenue level at which the business stops bleeding. That single number defines survival. Here is the formula in plain language, three sector-by-sector worked examples (cafe, Shopify, salon), the three levers that move it, and how nouz makes it visible monthly and daily instead of quarterly and late.
Ibrahim Ölmez
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25 May
Booth rental (chair rental): how the model works, what it earns, and when it beats commission
Booth rental gives the salon owner predictable weekly revenue and zero payroll risk — at the cost of zero upside if the stylist has a record month.
Ibrahim Ölmez
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25 May
Average check (avg ticket): the fastest signal of pricing strength and upsell discipline
Average check is total revenue divided by number of transactions (or covers). It is the single fastest weekly signal that pricing has slipped, an upsell habit has dropped, or a menu change quietly cannibalised a higher-ticket item.
Ibrahim Ölmez
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25 May
Average Order Value (AOV): the formula, break-even comparison and worked example
AOV is what an average order is worth to you — but it only means something when you compare it to the AOV your unit economics actually need.
Ibrahim Ölmez
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25 May
Same-day profit and loss: what it means and why it changes shop owners' decisions
Same-day profit and loss is your EBIT settled before lock-up — today's number, tonight, not next month from an accountant. Here's what it means, the exact formula, and the decisions it changes for cafe, retail, salon and e-commerce owners.
Ibrahim Ölmez
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24 May
Daily vs monthly P&L: the difference between an operator instrument and a tax document
A monthly P&L is the historical record your accountant produces for tax and audit. A daily P&L is a different instrument — a same-day signal that tells you whether today paid for itself, in time to change tomorrow. They answer different questions, run on different clocks, and serve different people. Most small shops only have the first one, and that is the gap this post is about.
Ibrahim Ölmez
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24 May
Best daily P&L tracker 2026: honest comparison of 5 options for small shops
The best daily P&L tracker in 2026 depends on what kind of shop you run. Café owners, boutique retailers, salon owners and Shopify operators each have a different right answer. Here's an even-handed look at five real options — nouz, QuickBooks Online, Xero, TrueProfit, and a DIY spreadsheet — so you can pick the one that actually fits.
Ibrahim Ölmez
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24 May
Accounting software vs daily P&L tool: two different instruments for two different jobs
Owners search 'best accounting software' when what they actually want is to know whether today made money. Those are different questions and they need different tools. Accounting software answers 'what did the year add up to, and what do I owe in tax'. A daily P&L tool answers 'did today pay for itself, before I close up'. This post explains the genres honestly, names where each fits, and walks through the order most small shops should adopt them.
Ibrahim Ölmez
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24 May
EBIT explained in plain English: the one profit number every shop owner should track
EBIT is the operating profit your shop earned today, before the bank takes interest and the tax office takes corporate tax. nouz computes it every evening using one formula: Gross revenue − Tax − Card fees − COGS − Variable costs − today's slice of fixed costs. Examples for café, retail, salon and e-commerce — and the owner-salary trap that flatters most P&Ls.
Ibrahim Ölmez
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09 May
Three spreadsheet sins, ranked. (And the one redemption.)
The three mistakes I see in nearly every shop spreadsheet I've ever inherited — mixing gross and net, hiding rent, and never reconciling the till — plus the small habit that fixes all of them.
Ibrahim Ölmez
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01 May
COGS vs. COGS percentage: which one actually tells you something
COGS is a euro number — what it cost to make what you sold today. COGS percentage is that number divided by revenue. The euro tells you what happened; the percentage tells you whether it should have happened that way.
Ibrahim Ölmez
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17 Apr
VAT for small business: what owner-operators actually need to know
VAT is a tax you collect on behalf of the government — it was never yours. Most spreadsheet errors I see are owners treating VAT-inclusive sales as revenue. Here's how it works, what to put in your P&L, and where the traps hide.
Ibrahim Ölmez
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02 Apr
Gross vs net revenue: the difference and why it determines whether your shop is profitable
Gross revenue is everything the customer paid. Net revenue is what stayed with your business after VAT, card fees and refunds came off. For a typical European shop the gap is 20-26% — and every margin, every menu price, every "is this product worth keeping" decision made on the gross number is silently wrong by exactly that gap.
Ibrahim Ölmez
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21 Mar
COGS snapshot explained: why nouz freezes cost-of-goods at the moment of sale (and not later)
When you sell a croissant in nouz, the product's current cost is frozen onto that revenue entry forever. If flour gets more expensive next month and you update the croissant's cost, today's sales keep their old cost and tomorrow's sales pick up the new one. That's the snapshot. It's the only way to make COGS honest in a small shop where supplier prices move every few weeks and you don't run period-end inventory counts.
Ibrahim Ölmez
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12 Mar
Depreciation for non-accountants: why the espresso machine costs €80/month for five years, not €4,800 in January
You spent €4,800 on an espresso machine in January. Was January a €4,800 loss month, or did you just convert cash into a five-year asset? Depreciation is how accountants answer. The cash leaves once; the cost on paper leaves slowly — €80/month for sixty months. Get this wrong and every year after the purchase looks healthier than it is, right up until the asset breaks and you discover you never put money aside to replace it.
Ibrahim Ölmez
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07 Mar
Accrual vs cash accounting in plain English: which lens your small shop is actually using
Most owners use cash accounting without ever calling it that — you log the money when it hits the bank. Most accountants want accrual — log it when it's earned, not when it's paid. The difference shapes when you call yourself profitable, when you owe tax, and what your daily P&L is actually saying. This post explains both, shows how the same February looks under each lens, and is honest about which one nouz uses by default.
Ibrahim Ölmez
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18 Feb
Fixed costs vs variable costs for small shops: the difference, with worked examples
Fixed costs are the scheduled payments your shop owes whether you sell anything or not. Variable costs scale with sales and operations. nouz slices both into a daily number so you can see, every evening, whether today actually paid for itself — instead of waiting for the month-end P&L.
Ibrahim Ölmez
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04 Feb
How to read a profit and loss statement: a 10-minute guide for shop owners
A profit and loss statement is a one-page subtraction story: revenue at the top, profit at the bottom, and seven or eight lines in between that explain where the money went. This guide teaches owner-operators how to read every line, what each number should look like for a small shop, and which ratios actually predict whether next month will be tight or comfortable. The same reading routine that nouz emits every evening, written out long-form.
Ibrahim Ölmez
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22 Jan
Chart of accounts for cafes and retail: the categorization rulebook that decides whether your P&L lies to you
Your chart of accounts is the list of buckets every euro flowing in or out of your business gets sorted into. Get it wrong and the same euro lands in the wrong group, your gross margin reads ten points off, your fixed cost number is half what it should be, and your monthly P&L tells lies you cannot unwind. This is the practical, plain-English guide for owners who want to stop outsourcing the structure to their accountant and never looking at it again.
Ibrahim Ölmez
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08 Dec