How to Calculate Business Income Tax in Kenya

Before any arithmetic, establish which regime applies, because three different businesses on the same street can be taxed three different ways. If you trade as a sole proprietor, the business has no separate tax identity: its profit is your income, and it is taxed on you at the individual graduated rates alongside anything else you earn. A partnership works similarly, with the profit split between partners according to the partnership agreement and taxed on each of them.

A limited company is a separate taxpayer. It calculates its own profit, pays corporation tax on that profit in its own name, and what it distributes to you afterwards is a separate matter with its own treatment. This is the single biggest practical difference between the two structures, and it is why the choice deserves more thought than it usually gets at registration.

Sitting alongside both is turnover tax, a deliberately simple regime for smaller businesses. Rather than asking you to compute profit, it charges a small percentage of gross sales. The trade-off is stark and worth understanding: it is far less work, and it takes no account of whether you made money. A business with thin margins can owe turnover tax in a year it made a loss, which is precisely the situation the profit-based regimes are designed to avoid.

There are also businesses that fall outside turnover tax entirely regardless of size, including limited companies and certain categories of income such as rental and professional income. If you are not certain which side of the line you sit on, that is the question to settle first, because everything downstream depends on it.

One piece of history is worth knowing because it still confuses people. A minimum tax charged on gross turnover regardless of profitability was introduced and then struck down by the courts as unconstitutional, on the reasoning that taxing a loss-making business on its sales is not a tax on income at all. Occasionally somebody still repeats the rule as though it applies. It does not.

This is the sequence, in the order you should actually do it. Each step depends on the one before, which is why starting with the rate and working backwards never goes well.

1. 1

   Total your revenue for the accounting period

   Everything the business earned in the period, whether or not the cash has landed yet. Credit sales count when the sale happened, not when the customer eventually pays. This is where businesses running on memory and M-Pesa statements first come unstuck: a bank statement shows receipts, not sales, and the two are rarely the same number.

2. 2

   Subtract the cost of what you sold

   Not what you bought, but what you sold. Opening stock plus purchases minus closing stock gives the cost of the goods that actually left the shop. Stock still sitting on your shelf at year end is an asset, not an expense, and treating it as one overstates your costs and understates your tax, which is a correction nobody enjoys making later.

3. 3

   Subtract your allowable running costs

   Rent, wages, electricity, transport, licences, bank and payment charges, professional fees, repairs, marketing. The test is whether the cost was incurred wholly and exclusively in order to earn the business income. Applied honestly, that test resolves most arguments before they start.

4. 4

   Add back anything that is not deductible

   Personal drawings, fines and penalties, capital spending, entertainment beyond what is permitted, and any expense you cannot evidence. If you spent it but cannot show what it was for, it does not reduce your tax however genuine it was, which is an argument for keeping records rather than an argument with KRA.

5. 5

   Claim capital allowances rather than expensing assets

   A fridge, a vehicle, shop fittings and equipment are not running costs. You do not deduct them in the year you buy them; you claim a portion of their cost over time through capital allowances. Getting this wrong in either direction is one of the most common errors in small-business returns.

6. 6

   Apply any losses brought forward

   A loss from an earlier year can generally be carried forward and set against later profits, which matters enormously for a business in its first few years. This only works if the loss was properly declared at the time, so filing a return in a loss-making year is worth the effort even when there is no tax to pay.

7. 7

   Apply the rate that matches your structure

   A resident limited company pays corporation tax on the taxable profit. A sole trader or partner adds their share of the profit to their other income and is taxed at the individual graduated bands. Confirm the current rate and bands on the KRA site before you compute the final figure; these are exactly the numbers a Finance Act moves.

8. 8

   Work out your instalment tax position

   Businesses whose tax liability passes a threshold are expected to pay in instalments through the year rather than in one lump at the end, with the balance settled after year end. If you only discover this at filing time you will be paying a year of tax at once, and possibly interest on top. Check whether it applies to you early in the year, not late.

9. 9

   File on time even if the number is zero

   A nil return is still a return, and not filing is a separate failure from not paying. The penalty for a late return applies regardless of whether any tax was owed, which makes missed filings the most avoidable tax cost a small business incurs.

Most of the difficulty above is not tax difficulty; it is record difficulty. The calculation is straightforward once you can state your sales, your purchases and your closing stock with confidence. Veira records every sale as it happens and keeps a running stock count, so those three figures exist all year rather than being reconstructed in a panic at filing time.

Because eTIMS invoicing runs through the same system, the sales figure you file is the sales figure KRA already holds. Reconciling the two stops being an exercise and starts being a formality.

Expenses and payments recorded against the business sit separately from anything personal, which removes the most common distortion in small-business accounts before it can take root. When your accountant asks for the year’s figures, the answer is an export rather than a weekend.