2026 Nigeria Tax Calendar: Every NRS and LIRS Deadline You Need to Know
The “wait and see” period for the 2026 tax reforms is officially over.
With the Nigeria Tax Administration Act (NTAA) 2026 now in full force, missing a single deadline isn’t just an oversight, it’s a high-speed collision with a ₦200,000 penalty.
As a business owner in Lagos, you are juggling two masters: the Federal NRS and the State LIRS.
We have mapped out the “Compliance Minefield” for the rest of 2026 so you can protect your bank account from a “Post No Debit” order.
The “Every Month” Deadlines (Monthly Rituals)
Regardless of the month, these three dates are non-negotiable for every registered business.
- 10th of Every Month: LIRS PAYE Remittance. You must remit the taxes deducted from your staff salaries to the Lagos State e-Tax portal.
- 21st of Every Month: NRS VAT & WHT Filing. All Value Added Tax (VAT) collected and Withholding Tax (WHT) deducted must be filed and paid on the NRS Portal.
- 21st of Every Month: 4% Development Levy (Monthly Installment). If you are a large taxpayer opted into installment payments, this is your monthly due date.
Quarter 1 & 2: The “Clean Up” Phase
- January 31 (Passed): LIRS Annual Employers’ Return (Form H1) was due. If you missed this, the ₦100,000 initial penalty is already ticking.
- March 31 (Critical): LIRS Personal Income Tax Returns. This is the deadline for every Lagos resident (individuals and freelancers) to file their 2025 income via the e-Tax portal.
- June 30: NRS Companies Income Tax (CIT) Deadline. For companies with a December 31st year-end, this is your final day to file your corporate tax and the new 4% Development Levy without a late fee.
Quarter 3: The “Medium Taxpayer” Hammer
- July 1: The Big Shift. This is the mandatory “Go-Live” date for all Medium Taxpayers (Turnover ₦50M – ₦1B) to fully integrate their accounting software (like Sage or Zoho) with the NRS MBS Portal.
- September 30: NRS Quarterly Review. The NRS typically begins its Q3 audit sweeps this month. Ensure all your digital receipts from the MBS portal match your bank statements.
Quarter 4: The “Year-End” Defense
- December 10: Final 2026 PAYE Prep. Ensure all staff bonuses and 13th-month salaries are correctly calculated for the final tax remittance of the year.
- December 31: Year-End Accounting Cut-off. This is the final day to capture expenses that can be used to reduce your 2027 tax burden.
The “Penalty Tracker”: What Happens if You Blink?
| Offence | Penalty (2026 Law) |
| Late VAT Filing | ₦50,000 first month; ₦25,000 subsequent. |
| LIRS Annual Return (Late) | ₦100,000 + ₦50,000 for every month of default. |
| MBS E-Invoicing Error | ₦200,000 per transaction + 100% of tax due. |
| Failure to provide records | Up to ₦20 Million (Investigative Notice). |
The Verdict: Automation is the Only Way Out
Our investigation into the 2026 landscape shows that “Manual Compliance” is dead.
The LIRS and NRS systems are now communicating in real-time. If you file with one and ignore the other, the “Red Flag” is automated. Use this calendar to set reminders in your phone exactly 5 days before each deadline.
In 2026, the taxman doesn’t knock on your door, he just pings your bank.
