Running a small shop: the complete guide

Before you open: test the idea, then run the numbers

Small businesses are fragile early on. In the US, 51.4% of private establishments that opened in the year to March 2020 were still open five years later (Bureau of Labor Statistics). Two habits improve the odds.

Test before you buy stock. Talk to around ten potential customers, then try to sell a small first batch, paid in advance. Ideas and the testing method are in small business ideas.

Write a 12-month budget forecast. It answers one question: will what I sell cover what I spend, and how much will be left for me? Build sales from units × average price, never from a round number you’d like to hit, and always run a second version with sales 30% lower. The one-hour method is in a simple business budget forecast, and the break-even calculator tells you how many sales cover your fixed costs.

Tax and paperwork for sole traders (Self Assessment, estimated tax, VAT, records) are mapped in the freelancer’s admin guide.

Dashboard 1: pricing

Start with cost price. Everything it costs you to sell one unit: direct costs (the item, shipping in, packaging, card or marketplace fees) plus a share of overheads (rent, insurance, energy, software). If you work in the shop yourself, add your time, or you’re pricing as if your labour were free. The overhead share depends on volume, so check it at a cautious volume. See cost price.

Then margin and markup. Always before VAT or sales tax, because that money isn’t yours.

• Margin = profit ÷ selling price.
• Markup = profit ÷ cost.
• Price for a target margin = cost ÷ (1 − target margin).

Rosa sells hand-poured candles. One costs her $12 to make and sells for $20: $8 profit, a 40% margin and a 66.7% markup. For a new scent at the same cost, a 45% margin means a price of $12 ÷ 0.55 = $21.82. Adding 45% to the cost instead ($17.40) would give her only a 31% margin.

The formulas are worked through in how to calculate profit margin and compared in markup vs margin. Use the profit margin calculator for your own items, and check any promotion with the discount calculator first: 20% off Rosa’s $20 candle leaves $4 of profit, half what she made before.

Dashboard 2: stock

Stock is cash sitting on a shelf. Three habits keep it under control.

A record for every product: SKU, unit cost, selling price, quantity on hand, reorder point. A spreadsheet with two tabs, “Products” and “Movements”, handles a small range, with current stock = opening stock + stock in − stock out calculated by SUMIFS. The template and formulas are in inventory spreadsheet template; the method without software is in how to manage inventory for a small business.

A reorder point for every product. If Rosa sells 4 of a scent a day, her wax supplier takes 7 days to deliver, and she keeps 10 as safety stock, she reorders when she’s down to 4 × 7 + 10 = 38. If delivery times vary, safety stock has to cover that too; before busy periods (Christmas, Black Friday, back to school), recalculate. Most stockouts start in the shop rather than at the supplier: see how to avoid running out of stock.

Regular counts. Count best sellers more often than the rest, and do a full count at least once a year. Prepare the week before, count in pairs zone by zone without looking at the book quantity, and value stock at cost: see how to do a stock take in one day. The gap between the record and the shelf is your shrinkage.

Dashboard 3: the till

The float is the change you put in the till at opening. It isn’t sales. Keep the same amount and the same mix of notes and coins every day; at closing, take the float out first, and everything left is the day’s cash takings. Our examples come to about $150 or £100; how to size yours is in cash float.

Over/short, every night. A Saturday at a London stall: float £100, cash sales recorded £486, £18 paid out of the till for bags. The till should hold £100 + £486 − £18 = £568. It holds £571: £3 over. Record it, work out why if you can, and never adjust the sales figure to make the till balance. Our cash book template does the sum each day.

Keep the evidence. HMRC lists till rolls among the records a self-employed person must keep, and the IRS lists cash register tapes among the documents that support gross receipts. If a customer paying cash wants proof, the receipt generator prepares one.

Dashboard 4: cash flow

A profitable shop can still run out of cash for weeks at a time: Christmas stock paid for in October, a wholesale customer on 60-day terms, a quarterly tax bill. A cash flow forecast lists, month by month for twelve months, the money coming in and going out, in the month it actually moves. A wholesale order invoiced in October on 60-day terms is December cash.

The number to watch is the closing balance. If any month dips below zero, or below the cushion you need, act before it arrives: move a stock order, ask for a deposit, negotiate supplier terms, or arrange an overdraft in advance. The method is in cash flow forecast for small businesses, and the 12-month cash flow forecast template is ready to fill in.

Selling beyond the shop: markets, messages and resale

At markets. You need a pitch from the market operator and, for street trading in England or Wales, a street trading licence from the council; trading without one can mean a fine of up to £1,000. Count stock out and back: units sold × price is what you should have taken, and it gives you margin per product. See selling at markets.

On Instagram and WhatsApp. Every order that arrives in a DM leaves the conversation within the hour, with a number and a status; one stock count covers every channel, and the item comes out of stock when the order is confirmed; and you ship only once the money is in your account, because a screenshot isn’t proof. Distance-selling rules for the UK and US are in selling on Instagram and WhatsApp.

Reselling. Real profit per flip takes off platform fees, the shipping label and packaging, then gets divided by the hours it took. See reselling for profit.

The tax and paperwork that come with it

The rules depend on where you trade and how you’re set up. The main ones for a sole trader:

• UK: once your gross trading income passes the £1,000 trading allowance in a tax year, register for Self Assessment by 5 October after that tax year. VAT registration becomes compulsory over £90,000 of taxable turnover in any rolling 12 months (VAT for sole traders). Business rates may apply to a shop, with small business rate relief for low rateable values (local business taxes).
• US: sales tax on goods is set by each state, so register with your state before your first sale. Card processors and marketplaces send a Form 1099-K above $20,000 and 200 transactions, but every sale is income whether or not you get a form.
• Everywhere: keep a sales record and a purchases record, each line pointing to a till roll, receipt or invoice (record-keeping for sole traders). When a business customer buys from you, send an invoice; our invoice examples include a shop invoice with two VAT rates, and the free invoice generator makes one in minutes.

A 20-minute weekly routine

The four dashboards only work if they’re current. A fixed weekly slot, same day each week, is enough.

Binome360 keeps these steps in one conversation. You log a sale, a delivery or a breakage in one sentence, by voice if your hands are full; the assistant drafts the stock movement and the sale, and you confirm. It keeps products, stock movements and margins, alongside your expenses, receipts and invoices.

What the app does for shops and resellers is on the stock and sales app for small shops page.

Frequently asked questions

What software do I need to run a small shop?

A spreadsheet works for a few dozen products and one person selling. Once you have hundreds of products, several people selling at once, several channels or expiry dates to track, a dedicated inventory tool starts to pay for itself.

What margin should a small shop aim for?

There’s no standard figure. US retailers averaged a 31.1% gross margin in 2022, and clothing stores 50.6%, but it varies hugely by product. Start from your cost price, add selling costs and fixed costs, then check what customers will pay.

How often should I do a stock take?

At least once a year for a full count. Counting your best sellers every month (cycle counting) means the annual count holds fewer surprises.

How do I know if my shop is making money?

Take sales minus the cost of the goods you sold, then subtract the month’s fixed costs. Then compare with your bank balance: a profitable month can still leave the account empty if the money went into stock.

In short

Running a small shop comes down to four dashboards: prices built from real cost price, stock updated with every movement, a till cashed up every night and a 12-month cash flow forecast. Each has its detailed guide above, and twenty minutes a week keeps them current. First action: tonight, count the till, take out the float and write down the over/short figure, even if it’s zero.

Sources

• US Census Bureau, Annual Retail Trade Survey: 2022, “Estimated Annual Gross Margin as a Percentage of Sales of U.S. Retail Firms by Kind of Business”: census.gov.
• US Bureau of Labor Statistics, Business Employment Dynamics, “Table 7. Survival of private sector establishments by opening year”: bls.gov/bdm/us_age_naics_00_table7.txt.
• US Small Business Administration, “Calculate your startup costs” (break-even formula) and “Write your business plan”: sba.gov.
• HM Revenue & Customs, “Business records if you’re self-employed: what records to keep”: gov.uk; IRS, “What kind of records should I keep”: irs.gov.
• GOV.UK, “Street trading licence (England and Wales)”: gov.uk/street-trading-licence.
• GOV.UK, “VAT registration: when to register”: gov.uk/vat-registration/when-to-register; HMRC, “Tax-free allowances on property and trading income”: gov.uk.
• IRS, “IRS issues FAQs on Form 1099-K threshold under the One, Big, Beautiful Bill; dollar limit reverts to $20,000”: irs.gov/newsroom.
• Binome360 calculations for the Rosa and market stall examples, September 2026.

Also available in Français.