AI agents for business finance: what they can and can't do
What AI agents can do in bookkeeping, close, collections and compliance today, where a person must stay in charge, and how to judge a product.
The short answer
To register a business with the Rivers State Internal Revenue Service, get your tax identification number, then register as a Rivers taxpayer (RIRS uses a Rivers State TIN, called RIVTIN) and pay state taxes through the RIVTAMIS portal or official channels. If you have staff, you must deduct PAYE and remit it to RIRS, which assesses and collects state taxes, fees and levies.
What RIRS does
The Rivers State Internal Revenue Service was created by the Board of Internal Revenue Law of 1993. It assesses, collects and accounts for taxes, fees and levies due to Rivers State and advises on tax policy. Its head office is Revenue House, Plot GS/1, in the Amadi Ama layout, Port Harcourt.
For a small business, RIRS matters in three ways:
- Your own income tax if you are a sole trader or partner, because personal income tax is paid to the state where you live.
- PAYE for employees, which you deduct from salaries and remit to RIRS every month.
- State levies and fees that apply to businesses, which RIRS assesses or collects.
Company income tax for a limited company is federal, not RIRS. Our national guide to small company tax under the Nigeria Tax Act 2025 covers that side, and how sole traders pay tax covers personal income from a business.
RIVTIN and the RIVTAMIS portal
In 2018 Rivers State introduced the Rivers State Tax Management portal, RIVTAMIS, to centralise tax collection. From 1 April 2018 the state required taxpayers to register for a Rivers State Tax Identification Number (RIVTIN) and pay taxes online. Uptake has been slow: a 2024 survey of 1,200 Rivers businesses by the Stakeholder Democracy Network found that only 8% used the portal, while 93% still paid in cash. Of those who did use it, most rated the experience good or excellent.
Step by step for a new business
- Register the business with CAC. If you have not yet decided which structure, see business name or limited company.
- Get your tax ID. Nigeria now uses a tax ID for individuals and businesses; our guide to getting a Tax ID for your business explains how. RIRS has previously offered free JTB TIN registration at its office on William Jumbo Street, Old GRA.
- Register on RIVTAMIS or at an RIRS office to obtain your RIVTIN and taxpayer profile.
- Register as an employer if you will have staff, so you can file and remit PAYE.
- Ask which state levies apply to your type of business and premises, and get them in writing.
- Keep every receipt and payment reference in one place, and file annual returns when due.
Who may collect PAYE and personal income tax
In 2021 Rivers State issued a regulation prohibiting private consultants and agents from assessing and collecting personal income tax. If someone who is not an RIRS official asks you to pay PAYE or personal income tax to them, decline and pay through RIRS channels instead. The SDN research found that consultants and task forces still collect other charges, so the same caution applies to any demand without an official bill.
A worked PAYE example
Example only, to show the routine rather than the tax figure. A Rumuola salon employs three staff on ₦120,000, ₦150,000 and ₦200,000 a month. Each month the owner works out each person's tax under the current bands, deducts it before paying salaries, and remits the total to RIRS with a schedule listing each employee. At year end, the salon files an annual return showing what was deducted and paid. The figures for each employee depend on the current law; our guide to PAYE tax bands for 2026 shows how to calculate them.
Getting help and checking demands
- Visit an RIRS office with your registration documents if the portal does not work for you.
- Ask for any assessment in writing and check it names the tax, the period and the amount.
- In 2026 the RIRS Executive Chairman, Sir Israel Egbunefu, said the service is working to end tax touting and digitise collection, which makes using official channels even more important.
A simple tax calendar for a Port Harcourt business
| When | What to do | Where |
|---|---|---|
| Before opening | Register with CAC, get your tax ID and RIVTIN | CAC, RIRS |
| Each month | Deduct PAYE from salaries and remit it with a schedule | RIRS |
| When demands arrive | Check the agency, tax and period; pay through official channels | RIRS or your council |
| Each year | File annual returns for PAYE and your own personal income tax if you are a sole trader | RIRS |
| Each year | Renew permits such as your RISAA sign permit and council charges | RISAA, council |
Put these dates in a shared calendar for whoever handles your books. Late filing usually costs more in penalties and time than the tax itself, and a business that files on time is in a stronger position to dispute an unexpected demand.
Where Pryme fits
A Pryme Business Account keeps business money separate, which makes your records cleaner when RIRS asks for them, and the Compliance and Finance agents can prepare PAYE schedules and payment reminders for your approval. Business accounts also pay bills such as electricity in the same app. See the Compliance agent.
Questions people ask
What is RIVTIN?
RIVTIN is the Rivers State Tax Identification Number. Since April 2018 the state has required taxpayers to register for one and pay taxes through its RIVTAMIS portal.
Where is the RIRS office in Port Harcourt?
The head office is Revenue House, Plot GS/1, Amadi Ama layout, Port Harcourt. RIRS has also used an office on William Jumbo Street, Old GRA, for TIN registration.
Does my limited company pay company tax to RIRS?
No. Company income tax is federal. RIRS handles personal income tax, PAYE for staff and state levies and fees.
Can a consultant collect PAYE for Rivers State?
No. A 2021 Rivers State regulation prohibits private consultants and agents from assessing and collecting personal income tax.
Sources
- Rivers State Internal Revenue Service (overview) · accessed Oct 2026
- Rivers Internal Revenue Service notice on free JTB TIN registration (X) · accessed Oct 2026
- Multiple taxation in Rivers State: the causes and impacts on businesses (Stakeholder Democracy Network, 2024) · accessed Oct 2026
- Rivers govt urged to protect businesses from fraudulent, violent tax collectors (Vanguard, March 2026) · accessed Oct 2026
- Rivers State Signage and Advertisement Agency: Services · accessed Oct 2026
This article is general information, not financial, legal or tax advice. Products described are provided under the terms on this site and are subject to regulation and eligibility.