Emeka runs a printing supplies business in Lagos. He keeps a folder on his desk for receipts. Sometimes he puts them there. Sometimes they go into his jacket pocket. Sometimes they end up on the back seat of his car, next to the fuel station booklets he has been meaning to file since February.
Every March, when his accountant asks for expense records, Emeka does the same thing: he spends three days trying to reconstruct four months of spending from bank statements, phone notes, and memory.
Last year, he estimated he spent roughly ₦1.8M on business expenses. He could only document ₦1.1M of it.
That ₦700,000 gap did not disappear. He paid tax on it as if it were profit.
In Nigeria, the Nigeria Revenue Service (NRS), formerly called FIRS, and the State Internal Revenue Services require business expense claims to be supported by documentation. A bank transfer record helps, but it is not always sufficient on its own. A proper receipt or invoice from the vendor is the standard proof.
When you cannot produce documentation for an expense, the tax authority treats that money as if it was never spent. It stays in your taxable profit. You pay tax on it.
The rule: every undocumented business expense is taxed as if it were profit.
This is not a technicality that only affects large companies. It applies to any business filing a tax return, including sole traders and small MSMEs.
Most MSME owners do not think of individual receipts as significant. A ₦12,000 diesel receipt feels trivial. A ₦45,000 generator service receipt is easy to forget. A ₦80,000 packaging order paid cash in Alaba feels too informal to document.
But these amounts compound.
What ₦2,160,000 of undocumented expenses costs you depends on how your business is taxed (Nigeria Tax Act 2025, from 1 January 2026):
That is not a rounding error. For many MSME owners it is a significant portion of what they consider their annual profit.
Cash purchases (fuel, market supplies, roadside printing) often produce a paper slip that gets pocketed immediately. By the time you reach the office, it has been sat on, forgotten, or thrown out with a parking ticket.
Many Nigerian vendors send invoices via WhatsApp voice note or photo. These sit in a chat thread, get buried under other messages, and become impossible to find six months later.
A cash payment at a market stall, a transport fare to a client site, a tip to a courier: these are real business expenses with no paper trail whatsoever unless you create one yourself.
The dedicated receipt folder is a good idea in theory. In practice, it becomes a pile that gets reviewed once a year under pressure, by which point half the receipts are faded or missing.
The fix is not a complicated filing system. It is one rule: record every business expense the moment it happens, before you leave the location.
① You pay for fuel: ₦18,500 cash at the filling station
② Before you drive off, open your expense tracker
③ Record: Date, Amount (₦18,500), Category (Fuel), Supplier (name of station)
④ Done: 30 seconds, expense documented
Your record (date, amount, supplier, category) is your first line of evidence. Keep the paper receipt or a photo of it as backup where you can.
If the vendor gives you a WhatsApp photo of the invoice, save it to a labelled folder in your phone immediately, not "later."
The key word is immediately. Once you leave the location, the probability of recording it drops sharply. By the time you are back at the office, two phone calls and one client WhatsApp later, it is gone.
You do not need to keep a complex spreadsheet. For each expense, capture five things:
That is everything you need to substantiate the expense at tax time. Categories to use: Fuel, Stock/Raw Materials, Equipment, Staff Costs, Transport, Professional Fees, Rent, Utilities, Marketing, Repairs.
Lucrive's Expenses page lets you record any business expense in about 30 seconds: date, amount, category, supplier, and payment method. (Lucrive's Receipts page is for money coming in: the receipts you issue to your customers.)
Your expenses feed the Expenses and Net Profit figures on your dashboard, so you always know what the business kept without running any calculation yourself. At tax time, the Tax Calculator's Import from Lucrive button pulls in the year's expenses alongside your invoices and cash sales.
Every expense you record the moment it happens is an expense that will not be missing when your accountant asks in March.
To start: create a free account at https://lucrive.io and record your next business expense before you leave the vendor. The habit takes 30 seconds to start and builds automatically from there.
Emeka started recording every expense on his phone the day he made the purchase. In his first full month, he documented ₦247,000 of expenses he would previously have lost: fuel, two market supply runs, a repair job, and several courier fees.
Over a year, that discipline adds up to real money. Not because any single receipt is large, but because none of them escape.
The habit is simple. The financial difference is not.
Start logging your business expenses today at lucrive.io.
This article is for general information, not tax advice. Confirm your position with a qualified tax adviser.
People and businesses in our examples are illustrative, not real Lucrive customers. Figures are worked examples: confirm your own position with a qualified tax adviser.