Tax Deductions in Nigeria 2025: 5 Claims Most Nigerians Are Missing

Under the Nigeria Tax Act 2025, five legal tax deductions most Nigerians have never heard of are sitting unclaimed. Verified directly from the Act: housing loan interest (Section 30(2)(a)(iv)), bad debt write-offs (Section 20(1)(h)), pre-commencement expenses (Section 20(1)(j)), research and development costs (Section 20(1)(i)), and assistive device expenses (Section 20(1)(m)). This article explains each one in plain language with real Nigerian examples.

Quick Summary: The 5 Deductions Covered Here

Here is a fast answer. Under the Nigeria Tax Act 2025, these five deductions are available and confirmed:

• Housing loan interest — Section 30(2)(a)(iv) — for anyone repaying a mortgage or building loan on their own home
• Bad debt write-off — Section 20(1)(h) — for business owners with clients who never paid
• Pre-commencement expenses — Section 20(1)(j) — for businesses that spent money before officially launching, up to six years back
• Research and development costs — Section 20(1)(i) — for any business investing in improving what they do
• Assistive devices — Section 20(1)(m) — for business owners with disabilities and employers who invest in inclusion

Also read Understanding the Nigeria Tax Act 2025: What Changed — for the full picture of what the new law introduced

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Let me tell you something that might actually make you smile in this economy.

The Nigeria Tax Act 2025 contains deductions the government legally allows you to subtract from your income before they calculate how much tax you owe. These are legal ways to shrink your tax bill. The smaller the income figure the tax authority sees, the less you pay.

Most articles you will find online about Nigerian tax deductions hand you the same recycled list: pension, NHIS, NHF, life insurance, rent relief. Those are real and valid. But they are the obvious ones. The ones that made the headlines.

What most people have not found is Section 20 of the same law. Quieter, less talked about, and packed with deductions that are sitting there — verified, legal, and completely unclaimed by the majority of Nigerians who qualify.

This article is about those ones.

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1. The Interest You Pay on Your Housing Loan

Picture this. Chidi saved for years, finally got a mortgage from a bank to build his own house in Enugu, and has been paying it back every month for the past two years. Every month, part of what he pays is the principal — paying back the actual loan — and part is interest, which is what the bank charges for lending him the money. He has been treating both as just "bank wahala."

What Chidi does not know is that the interest portion of his monthly repayment is fully tax-deductible under Section 30(2)(a)(iv) of the Nigeria Tax Act 2025. Not the full repayment. Just the interest. But on a ₦20 million loan, that could be ₦2.4 million to ₦3.6 million in deductible expenses per year that most borrowers are leaving on the table.

Two conditions to know before you claim this:

• This only applies to a loan used for a house you personally live in as the owner. The law specifically says "owner-occupied residential house." It does not cover investment properties.
• You need your bank's annual loan statement showing the interest versus principal breakdown. That is your documentation.

If you or anyone you know is currently repaying a mortgage or a bank loan used to build their personal home, this conversation needs to happen with your HR team or tax consultant immediately.

Also read How to Read Your Bank Statement for Tax Purposes — for tracking and documenting loan interest payments correctly

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2. When Your Customers Never Paid You Back

This one is for business owners, traders, freelancers, and consultants. If you have been in business in Nigeria for any reasonable time, you have at least one customer who owes you money that you know in your heart is never coming back.

Maybe you delivered goods to a buyer in Lagos who disappeared. Maybe you completed a project for a company that shut down after your invoice. Maybe you gave credit to a regular customer who relocated without settling.

Under Section 20(1)(h) of the Nigeria Tax Act 2025, money genuinely owed to your business that has become irrecoverable — what accountants call a bad debt — can be deducted from your taxable business income in the year it becomes clear the money is gone for good.

Think about what this means in practice. If your business generated ₦8 million in revenue but ₦1.2 million was owed by a client who has completely vanished, your taxable income is ₦6.8 million, not ₦8 million. The government only taxes what you actually received.

Three conditions must be met to claim this deduction:

• The debt must be from your business, not a personal loan to a friend.
• The debt must not be from a related party — the law explicitly excludes family members or connected businesses.
• You must show genuine recovery efforts were made. A slow-paying client does not count. A bankrupt or vanished client with documented evidence does.

Keep everything: invoices, demand letters, emails, WhatsApp messages, and any evidence the debt existed and that you tried to collect it. The NRS will ask you to prove it before approving this deduction.

Also read : Freelancers in Nigeria: Are You Overpaying Tax? — for self-employed readers on all business expense deductions available

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3. What You Spent Before Your Business Even Opened

This one surprises almost every entrepreneur who hears it for the first time.

Imagine Fatima spent eight months building everything before her fashion brand officially launched. During those eight months she was paying for fabric samples, branding consultations, content shoots, website development, and market research trips to Aba and Kano. Because the business was not yet officially open, she assumed none of it was deductible.

She was wrong, and she left a significant amount of money unclaimed.

Section 20(1)(j) of the Nigeria Tax Act 2025 allows you to deduct expenses incurred before your business commenced, going as far back as six years prior to the start date, as long as those expenses would have qualified as deductible if the business had already been running. The law treats all of those pre-commencement costs as if they were incurred on the very first day your business opened.

This is particularly valuable for:

• Tech founders who spent months or years building before their first paying customer
• Farmers and agribusiness owners who invested in land preparation and soil testing before their first harvest
• Creative professionals like filmmakers, designers, and musicians who spent heavily on equipment and training before their first commercial project
• Professional service providers like lawyers, consultants, and architects who paid for registration and certifications before officially opening

If you launched a business in the last few years and had significant costs before the launch date, go back through your records right now. There are deductions sitting in old receipts you have never claimed.

Also read Understanding the Nigeria Tax Act 2025: What Changed — specifically the small business section on the ₦100M threshold

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4. Money Spent on Research and Development

Here is something worth knowing. Nigeria has over 3,000 active technology startups, making it one of the top five startup ecosystems on the African continent. And yet most Nigerian founders have no idea that money spent improving their product, process, or service is a legitimate tax deduction under Nigerian law.

Section 20(1)(i) of the Nigeria Tax Act 2025 explicitly allows businesses to deduct expenses incurred on research and development. The law does not define R&D narrowly — it is not limited to laboratories or pharmaceutical companies.

Real Nigerian examples of what qualifies:

• A logistics company that paid a team to test a new route optimization system before rolling it out
• A food brand that ran consumer taste panels before launching a new product
• A software startup that paid engineers to build a feature that did not make it into the final product
• A farmer who trialed a new seed variety with an agronomist before committing fully
• A fashion designer who paid for fabric performance testing before going into full production

Documentation needed: contracts with developers or researchers, invoices from consultants, receipts for materials used in testing, and payment records for professional fees.

The NTA 2025 formally acknowledges that investment in improvement is a legitimate business cost. If you invest in making what you do better, the tax system is now on your side.

Also read : Freelancers in Nigeria: Are You Overpaying Tax? — for freelancers who invest in tools and skills development

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5. Assistive Devices and Disability-Related Products

This last one is not just about money. It is also about recognition, and it is one of the most overlooked provisions in the entire NTA 2025.

Section 20(1)(m) explicitly allows businesses to deduct expenses on assistive devices and disability-related products — hearing aids, wheelchairs, braille materials, and similar items.

• A business owner who uses a wheelchair and purchases one for use in running their operations can deduct that cost. The tax system formally acknowledges that running a business with a physical disability comes with additional legitimate expenses.
• An employer who invests in accessibility by purchasing screen-reading software for a visually impaired employee, or captioning tools for a hearing-impaired team member, can deduct those costs. This is the government directly incentivising workplace inclusion.
• A school or training organisation that buys braille materials, audio learning tools, or mobility aids for students with disabilities can deduct those purchases as legitimate business expenses.

Over 25 million Nigerians live with one form of disability or another. This deduction formally recognises that those costs are real and deserve the same tax treatment as any other legitimate business expense.

Keep your receipts, invoices, and where applicable, any professional or medical recommendation confirming that the device was functionally necessary for your business operations.

Also read:  Understanding the Nigeria Tax Act 2025: What Changed— for context on the Tax Ombudsman who handles deduction disputes

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What All Five Have in Common

None of these deductions apply automatically. Section 31 of the NTA is unambiguous: deductions must be claimed in writing. Section 32 gives the NRS the right to demand documentary evidence before approving any deduction. If you cannot produce that evidence, the deduction can be denied entirely.

What this means practically:

• Keep every receipt, invoice, and payment record related to any expense that could qualify.
• Separate your business and personal expenses. Mixed records are harder to defend.
• File a self-assessment return if you have income outside your salary.
• Speak to a registered tax consultant before filing — they often find deductions you missed.

These five provisions are in the law, verified directly from the NTA 2025 document, and exist for people who know where to look and have the discipline to keep their paperwork in order.

Now you know where to look.

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Taxidy is built by Nigerians who understand exactly how confusing this system is.

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Sources: Nigeria Tax Act 2025, Sections 20(1)(h), 20(1)(i), 20(1)(j), 20(1)(m), 30(2)(a)(iv), 31, 32. Verified against official NTA 2025 document.