How to declare multiple income streams for proper taxation 

For many Nigerian professionals who juggle their white-collar jobs and side hustles, the new tax laws have brought both a sigh of relief and a heavy dose of responsibility.

Under the Nigeria Tax Act (NTA) 2025, which took full effect this month, the government has moved toward a consolidated, digital-first system.

But for those with multiple income streams, the big question remains: How do I declare everything without getting taxed twice? Here is your step-by-step guide to navigating the 2026 tax landscape legally and efficiently.

Does a 9-to-5 job with existing PAYE deductions exempt other income from tax scrutiny?

The most important change for multi-hyphenate professionals is income consolidation. In the eyes of the law, you are one taxable person, regardless of how many jobs you have.

“By the time an employee is accounting for his or her activities by March, the law expects you to take cognisance of the emoluments from your 9-to-5 plus whatever earnings you have from side gigs,” says Ajibola Sogunro, Partner at Forvis Mazars.

This means that instead of treating side hustles as a separate entity,  add all your annual earnings together into one bucket before applying the new progressive tax bands.

For the formal employment (9-5),  employers already deduct PAYE (Pay As You Earn) tax monthly, so for other incomes, every March, you must file a personal return with your State Internal Revenue Service (SIRS).

You then subtract the tax your employer already paid on your behalf and pay the difference on the extra earnings.

Will the consolidation of income streams lead to an increased tax liability?

Sogunro said that consolidation ensures accuracy rather than a simple increase. Nigeria utilises a progressive tax band system. Aggregating side income with a primary salary may move a taxpayer into a higher bracket, but the first ₦800,000 of total annual income remains tax-free under the current reforms.

What are the applicable 2026 Personal Income Tax (PIT) bands?

Complete relief is provided to low-income earners, as the first N800,000 of annual income is tax-exempt. For earnings above this threshold, the law applies a layered approach: the next N2,200,000 is taxed at 15 percent, the next N9 million at 18 percent, and the subsequent N13 million at 21 percent. Higher earners face a 23 percent rate on the next N25 million, while any annual income exceeding N50,000,000 is subject to a maximum rate of 25 percent.

How can over-taxation be avoided when declaring side income?

Claiming deductions allows you to pay less tax; declaring more income doesn’t always mean paying significantly more tax.

Olufemi Olarinde of the Nigeria Revenue Service (NRS) said that, unlike employment income, business income allows for deductions.

“ Consultant or freelancer, you can deduct costs for data/internet, software subscriptions, electricity/fuel for your home office, and even work-related travel.”

What role does the new “Rent Relief” play in reducing tax liability?

The 20 percent Rent Relief should also be deducted from your annual rent (capped at N500,000) from your total taxable income.

Payments made to assistants or for specialised tools are deductible.

“Tax is calculated on profit, not total inflow,” says Olarinde.

This meand that  N1 million is paid into your POS or bank account, but you spent N700,000 on supplies and data, you are only taxed on the N300,000 profit.

What are the primary risks associated with managing multiple income streams?

Sogunro said that at the end of the year, after the employer has played its role of remitting taxes every month, and filing annual returns on or before 31st of January of the following year, such an employee has the obligation to also file his or her returns on or before 31st of March.

“ Unfortunately, the new tax law, particularly the Nigerian Tax Administration Act, does not specify the timeline for filing. Well, maybe we want to assume until when the relevant tax authority issues a circular public notice, or what have you. So we might want to assume that the previous timeline of on or before the 31st of March of the following year will still be applicable,” he said.

Olarinde also mentioned that the commingling of personal and business funds remains a significant risk. If side venture proceeds are paid into a personal salary account, tax authorities may find it difficult to distinguish between non-taxable gifts and taxable business income. Given the mandate to monitor cumulative bank inflows exceeding N25 million, the maintenance of a separate business account is the most effective way to verify profit and avoid excessive assessments.

If your side hustle money goes into your personal salary account, the taxman may struggle to distinguish between a “gift” and “taxable income.

The 2026 Compliance Action Plan

Both experts said that to ensure full compliance with the 2026 tax regulations, professionals must adopt a structured approach to financial management. This begins with account separation, involving the maintenance of a dedicated bank account for all side ventures to distinguish business income from personal funds.

Coupled with this is the necessity for diligent documentation, specifically the retention of digital receipts for all business-related expenditures to substantiate deductible claims.

By February, taxpayers should prioritise consolidation, aggregating all PAYE payslips from primary employment with side hustle profit records to determine total annual earnings. Finally, the process concludes with early filing, ensuring the submission of a consolidated self-assessment via the relevant State Revenue portal in early March to avoid the statutory penalties associated with the March 31st deadline.