Common Rev360 Filing Mistakes Businesses Should Avoid

A new filing portal creates a dangerous type of confidence.

The page looks clean.

The buttons respond.

The internet is working for once.

Suddenly, everyone feels ready to file.

Unfortunately, a working Submit button does not mean the figures behind it are correct.

Most Rev360 filing mistakes are not caused by somebody clicking the wrong shade of green.

They begin earlier:

• incomplete records
• wrong taxpayer identity
• mixed-up tax types
• missed credits
• weak review
• last-minute filing
• careless account access

Here are ten mistakes Nigerian businesses should fix before they become expensive stories.

Information reviewed on 14 June 2026. Rev360 processes and screens may change during the phased rollout.

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Quick pre-filing check

Before filing, confirm:

• correct taxpayer account
• correct tax type
• correct period
• complete income records
• supported expenses
• reconciled VAT
• reconciled WHT credits
• reviewed payroll figures
• applicable deadline
• authorised reviewer
• saved submission evidence

If three or more of those made you pause, do not rush to the portal yet.

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Mistake 1: Creating a new taxpayer profile when the real problem is login access

An existing TaxPro Max taxpayer may already have:

• previous returns
• payment receipts
• assessments
• WHT credits
• tax-clearance history
• outstanding obligations

Forgetting the password does not make that history disappear.

Before registering as completely new, use the existing-taxpayer login, credential-creation or recovery routes presented on the official NRS taxpayer self-service portal.

Duplicate taxpayer records can create confusion around:

• which identity is valid
• where payments were posted
• which account holds credits
• which record should receive future filings

Recover access before creating another identity.

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Mistake 2: Filing before reconciling the records

A spreadsheet total is not automatically a filing-ready total.

Before entering figures, compare:

• invoices
• receipts
• bank inflows
• credit notes
• cancelled transactions
• sales schedules
• accounting records
• previous returns

Ask:

• Are all sales included?
• Are transfers between company accounts being counted twice?
• Are loans being confused with income?
• Are refunds reducing the correct period?
• Do invoices and bank records tell the same story?

A number can be neatly formatted, bold and completely wrong.

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Mistake 3: Treating every bank inflow as taxable business income

A bank statement is useful evidence.

It is not a complete tax calculation.

An inflow may represent:

• customer revenue
• a loan
• shareholder funding
• transfer between company accounts
• refund
• asset disposal
• reversed transaction
• money received on behalf of another person

Classify the transaction properly.

Do not simply total every credit alert and call it turnover.

Likewise, do not assume that every bank debit is an allowable business expense.

The transaction must be understood and supported.

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Mistake 4: Mixing PAYE, VAT, CIT and WHT

These taxes do not become one friendly family because they appear on the same portal.

PAYE

Generally relates to employment income and payroll withholding.

VAT

Relates to applicable taxable supplies and VAT collection or recovery rules.

Company Income Tax

Relates to company profits and the applicable tax framework.

Withholding Tax

Often operates as a deduction or advance credit connected to particular transactions.

Keep separate:

• records
• calculations
• schedules
• payment references
• filing periods
• supporting documents

A WHT credit is not automatically a VAT payment.

VAT collected is not casual business profit.

PAYE deducted from employees should not disappear into general company spending.

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Mistake 5: Ignoring previous balances, payments and WHT credits

Before creating a new filing, inspect the historical position.

Check:

• previous returns
• outstanding assessments
• payments already made
• receipts
• credits
• WHT notes
• refunds
• unresolved correspondence

A business may accidentally:

• pay an obligation twice
• miss an available credit
• carry forward an incorrect balance
• ignore an old assessment
• assume a payment was posted correctly when it was not

Compare the portal position with the company’s own records.

Where they differ, investigate before adding another period.

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Mistake 6: Selecting the wrong period or tax type

A correct figure entered under the wrong period is still a problem.

Before filing, confirm:

• tax involved
• monthly or annual obligation
• start and end date
• accounting year
• assessment year where applicable
• entity involved
• filing deadline
• payment deadline

This becomes especially important when one person manages:

• several companies
• several branches
• multiple tax types
• current and outstanding periods

Read the period twice.

Submit once.

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Mistake 7: Waiting until the deadline to discover an account problem

Last-minute filing turns small problems into emergencies.

On the final day, you may discover:

• the registered email is inaccessible
• the phone number is inactive
• an OTP is not arriving
• the authorised employee has left
• a director is unavailable
• an old consultant controls the account
• the Tax ID does not match the business
• a migrated record appears incomplete
• the internet provider has chosen violence

Test access before the filing day.

Confirm who can:

• log in
• prepare the figures
• review the figures
• approve submission
• make payment
• save the evidence

A deadline is not the best time to begin account recovery.

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Mistake 8: Entering figures without independent review

The person who prepared a calculation can miss an error because they already know what they expected to see.

Use a simple review process.

The reviewer should ask:

• Does the filing period match the records?
• Does turnover reconcile?
• Are expenses supported?
• Are payroll figures complete?
• Were credits included correctly?
• Does the liability make sense compared with previous periods?
• Are unusual changes explained?
• Has the correct company been selected?

For a very small business, “independent review” may simply mean the founder carefully checking the accountant’s summary before submission.

Someone should challenge the numbers before the portal does.

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Mistake 9: Sharing passwords and OTPs carelessly

A consultant may need information.

That does not mean everyone needs unrestricted account control.

Avoid:

• posting credentials in group chats
• sending OTPs to unknown people
• allowing former employees to retain access
• using one weak password across several services
• storing credentials in an unprotected spreadsheet
• entering account details on unofficial websites

Know who is authorised.

Change access when a responsible employee or consultant leaves.

TaxCalc will never ask for your Rev360 password, OTP or government portal credentials.

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Mistake 10: Failing to preserve evidence after submission

The work is not complete when the screen says “successful.”

Save the relevant:

• acknowledgement
• filing reference
• submitted return
• payment reference
• payment receipt
• assessment
• calculation schedule
• supporting documents
• approval record
• screenshot where appropriate

Use clear filenames.

Good:

2026-05-VAT-Return-Acknowledgement.pdf

Less good:

download (17).pdf

Store evidence in a folder connected to the correct:

• company
• tax type
• filing period
• year

Future you should not need detective training to find a receipt.

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Bonus mistake: Assuming zero tax payable means no compliance responsibility

A business may calculate little or no tax payable and still have filing, documentation or reporting obligations.

Possible reasons for a low liability may include:

• exemption
• loss position
• available credit
• small-company treatment
• no activity during the period
• deductions or reliefs

Do not simply decide:

“The answer is zero, so there is nothing to do.”

Confirm what filing or documentation is still required.

Zero payable and zero responsibility are not identical phrases.

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A safer Rev360 filing workflow

Use this order:

Step 1: Confirm identity and access

Know the correct taxpayer record and who controls it.

Step 2: Organise the source records

Gather sales, expenses, payroll, VAT, WHT and historical documents.

Step 3: Reconcile

Compare invoices, bank activity, ledgers, returns, payments and credits.

Step 4: Calculate

Estimate the liability before opening the filing screen.

Step 5: Review

Have an authorised person challenge the figures and period.

Step 6: Confirm the deadline

Know both the filing and payment dates.

Step 7: Complete the official process

Use the genuine NRS portal.

Step 8: Preserve evidence

Save the return, acknowledgement, references and receipts.

Step 9: Reconcile again

Confirm that payment, credits and filing status appear as expected.

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How TaxCalc can help before filing

TaxCalc can help you:

• estimate Company Income Tax
• estimate PAYE
• organise Smart Tax Sheet records
• review tax deadlines
• generate clearer calculation reports
• check Rev360 preparation readiness

TaxCalc does not:

• log into Rev360 for you
• request portal credentials
• submit NRS returns
• receive government tax payments
• guarantee filing acceptance
• certify tax compliance

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Frequently asked questions

What is the most common Rev360 filing mistake?

One of the most damaging mistakes is entering figures before reconciling the underlying records. A smooth portal experience cannot make incomplete records accurate.

Should an existing TaxPro Max user register again?

Not automatically. Existing taxpayers should first use the TaxPro Max credential, Rev360 credential-creation or recovery options shown on the official portal.

Should every bank inflow be reported as turnover?

No. Understand and classify each inflow properly. Loans, transfers, refunds and shareholder funding are not automatically the same as sales revenue.

Can a company have no tax payable but still need to file?

Potentially, yes. Filing and documentation requirements may still apply even where the calculated amount payable is zero. Confirm the applicable obligation.

Should I give my Rev360 OTP to someone helping with calculations?

No. A person does not need your government portal OTP merely to help calculate tax. Protect account credentials and use properly authorised access arrangements.

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Final word

Most filing mistakes are not mysterious.

They usually come from:

• rushing
• guessing
• mixing records
• weak review
• poor access control
• missing evidence

Rev360 may change how the return reaches the tax authority.

It does not change the need to know what you are submitting.

Prepare first.

Calculate second.

Review third.

Then click Submit.

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Related reads

• Rev360 Guide and Readiness Checker
• Rev360 Nigeria: What Businesses Should Prepare Before Filing
• Rev360 Login and Registration Guide
• Rev360 vs TaxPro Max: What Changed?
• Small Business Tax in Nigeria: PAYE, CIT and VAT

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Disclaimer

TaxCalc.ng provides independent educational information, estimates and preparation tools. It is not affiliated with the Nigeria Revenue Service. TaxCalc does not submit Rev360 returns, receive NRS payments, certify compliance or request portal credentials. Tax rules, portal processes and filing requirements may change. Confirm current obligations with the relevant tax authority or a qualified tax professional.