Corporate Income Tax Return Tanzania: Deadline, Documents, Payment and Penalties

The return is filed online through TRA's taxpayer portal. It closes the year that began with the statement of estimated tax and four provisional instalments. Income tax is a Union tax, so a company in Zanzibar also files with TRA, not with the Zanzibar Revenue Authority (ZRA).

What the law says about the corporate income tax return

The corporate income tax return Tanzania companies file is the final return of income under the Income Tax Act, Cap. 332 R.E. 2023. In the 2023 revised edition, published by TRA and by the Office of the Solicitor General, the provisions sit in Part VII on tax payment procedure. Section 113 covers quarterly instalments, section 114 the statement of estimated tax payable, and section 117 the returns of income. Section 118 lists cases where a return is not required.

Older guides and many firm notes still cite sections 88, 89 and 91. Those are the numbers in the 2019 revised edition. The revision of 2023 renumbered the Act. Cite the R.E. 2023 numbers in any letter to TRA.

TRA's own corporation tax page states the deadline in plain terms: final returns are submitted within six months from the end of the accounting period. The Finance Act, 2025, section 59, rewrote section 117(3)(b). Since 1 July 2025, the financial statements of a corporation whose gross income in a year of income exceeds TZS 100 million must be prepared or certified by a certified public accountant in public practice.

Filing and payment rules for every tax sit in the Tax Administration Act, Cap. 438 R.E. 2023. Section 45 deals with tax returns, section 46 with electronic filing, section 48 with extensions of time to file, and sections 86 to 90 with interest and penalties. In the 2019 edition, published by the Ministry of Finance, the same rules on interest and the late filing penalty were sections 75, 76 and 78.

Who is affected by the annual return?

TRA lists the bodies liable to corporation tax. Each of them files a final return of income every year.

• Limited companies resident in Tanzania, whether trading, holding or newly formed.
• Domestic permanent establishments, meaning branches of non-resident companies. The Act defines a permanent establishment to include a fixed place of business and a construction project lasting more than six months.
• Trusts, clubs, co-operative societies, charitable organisations and non-governmental associations, which TRA names on its corporation tax page.
• Political parties and government agencies, also named by TRA.

A company that made a loss still files. The return is where the loss is recorded and carried forward, and where the alternative minimum tax test is applied. PKF Eastern Africa notes in its guide to TRA's IDRAS system that unrelieved tax losses must be properly entered to be reflected in later filings. Our note on tax loss carry forward covers the loss rules.

When is the corporate income tax return due?

The year of income is the calendar year. Section 20 of the Act lets the Commissioner approve a different twelve-month period where a taxpayer shows a compelling need, with a transitional period of up to 18 months. The return deadline then follows the approved year-end.

The quarter-end estimate dates match TRA's corporation tax page, which gives 31 March, 30 June, 30 September or 31 December depending on the accounting period. An extension moves the filing date only. It does not move the payment date, as the next sections explain.

PwC's Worldwide Tax Summaries, last reviewed on 9 September 2026, reports a nine-month deadline for public sector entities. We did not find that rule in the TRA page we read, so public bodies should confirm it with TRA.

What must accompany the return of income?

TRA's IDRAS portal, live since 9 February 2026 according to PKF, takes the return as an online form with attachments. We did not find a TRA page on 7 October 2026 that lists current return form numbers, so this guide names the content rather than a form code.

Related party disclosures carry their own risk. A transfer pricing adjustment attracts a penalty of the higher of 30 percent of the adjustment or 100 percent of the tax shortfall (register NEW-02-12). Our guide to transfer pricing and related party compliance covers the documentation.

What rate applies on the corporate return?

The standard corporate rate is 30 percent of total income (register F0196, First Schedule paragraph 3(1)). The same 30 percent applies to a domestic permanent establishment of a non-resident. A branch also pays 10 percent on repatriated income (F0201).

The alternative minimum tax applies where a corporation has a perpetual unrelieved loss for the year of income and the previous two consecutive years. It is 1 percent of turnover (F0198), raised from 0.5 percent by the Finance Act 2025. Section 4(8) excludes corporations in agricultural business and those providing health or education. Tea processing is excluded from 1 July 2024 to 30 June 2027. RSM Tanzania's Tanzania Tax Guide 2025/26 describes the same 1 percent charge on entities making tax losses for three consecutive years.

Reduced rates exist for some newly listed companies and for new manufacturers under a performance agreement (F0197, F0199, F0200). They are claimed on the return, so the evidence must be in the file before filing.

How do provisional tax instalments fit with the final return?

The final return is the second half of a two-step system. In the first three months of the year, a company files a statement of estimated tax payable and pays the first of four equal instalments. TRA's page says the first instalment is due when the statement is submitted. The remaining instalments fall at the end of months six, nine and twelve.

The final return then compares the real liability with what was paid. Tax payable on the return, less instalments and withholding credits, is the balance due. If the estimate was below 80 percent of the correct tax, interest for underestimating runs at the statutory rate compounded monthly (register NEW-02-10, TAA s.86). Our guide to provisional tax in Tanzania sets out the estimate and the 80 percent test in detail.

Withholding suffered during the year also reduces the balance. The credit needs the payer's certificate on the system. See our note on withholding tax on local payments.

When is the balance of tax payable?

The balance is due on the date the final return is due. TRA states that the self-assessed final tax payment deadline coincides with return submission. PwC reports the same rule for final tax. Section 65 of the Tax Administration Act makes tax under a self-assessment payable at the time the tax law specifies.

Payment is made against a control number generated in the portal, by bank or mobile money. The control number carries the TIN, the tax head and the period. A payment posted to the wrong period is a common reason for a later demand notice and for a refused tax clearance certificate.

A company that cannot pay in full may apply in writing for more time under section 66. The Commissioner General may extend the date, including by instalments, where good cause is shown. If an agreed instalment is missed, the whole balance and interest fall due at once.

Can a company get more time to file?

Yes, once and for a short period. Section 48 of the Tax Administration Act allows an application for an extension of time to file. The application must be in writing and made not less than fifteen days before the due date. Any extension granted cannot exceed thirty days from the due date. The extension does not alter the date for payment of tax.

So a company with a 31 December year-end must apply by 15 June to have a chance of filing by 30 July. Tax unpaid on 30 June still draws interest from 1 July. RSM's guide gives the same 30-day limit and notes that the payment date stays fixed.

Audits that run late are the usual reason for an application. TRA decides each application. A refusal leaves the original date in place, so the application is not a substitute for planning the audit timetable.

What are the penalties for late filing and late payment?

Late filing and late payment are charged separately. The penalty runs for each month or part of a month that the failure continues. Interest runs on unpaid tax from the due date. All amounts below are from the Zatra fee register at 26 September 2026.

The Commissioner General may remit interest and penalties under section 81. Remission is discretionary. A company should apply with reasons and evidence, and keep paying the tax itself.

Worked example: a December year-end company filing two months late

For example, take a Dar es Salaam trading company, Mwambao Distributors Ltd, with a 31 December 2025 year-end. Its tax computation shows total income of TZS 800,000,000. During 2025 it paid four instalments of TZS 50,000,000 each against an estimate of TZS 200,000,000. It suffered no withholding tax.

The two-month delay cost about TZS 2,585,460 on a balance of TZS 40 million. Had the company paid the balance on 30 June and filed late, the 2.5 percent limb would have shrunk to nil, because tax assessable less tax paid would be zero. The 15 currency point floor would still apply: TZS 300,000 a month, or TZS 600,000 for two months.

The interest line is an illustration. TRA computes interest on its own ledger, and the rate is set each quarter. The penalty and interest are paid to TRA at the official amount against its control number. They are separate from any professional fee, and Zatra never marks them up.

What is the deemed distribution rule after the return?

Filing the return is not the last income tax date for a profitable company. Section 33A, inserted by the Finance Act 2025, lets the Commissioner treat part of the profit as distributed if the company makes no distribution within twelve months after the end of the year of income. The Finance Act, 2026, section 22, cut the share from thirty to fifteen percent from 1 July 2026 (register F0202).

The deemed amount is taxed as a dividend through withholding: 10 percent in the general case (F0207), or 5 percent for a resident company holding 25 percent or more (F0206). The 2026 Act exempts companies listed on the Dar es Salaam Stock Exchange, financial institutions, insurance companies and mining companies with a Framework Agreement. Clyde & Co's note on the Finance Act 2026, published on 3 July 2026, reports the same change.

For Mwambao, profit after tax of TZS 560,000,000 kept in full until 31 December 2026 could see TZS 84,000,000 treated as distributed. At 10 percent, that is TZS 8,400,000 of withholding tax. A board deciding on dividends should read our guide to repatriating profits and dividends before that date.

Does a Zanzibar company file with TRA or ZRA?

With TRA, for income tax. Section 2 of the Income Tax Act states that the Act applies to Mainland Tanzania as well as Tanzania Zanzibar. Income tax is a Union matter. The Zanzibar Revenue Authority describes its own role as administering domestic non-Union taxes in Zanzibar, such as Zanzibar VAT, hotel levy and stamp duty.

A Zanzibar company therefore deals with two revenue authorities: TRA for income tax and ZRA for VAT and other Zanzibar taxes. Our guide to Union and non-Union taxes explains the split. Confirm ZRA's own filing calendar with ZRA.

What happens if TRA disagrees with the return?

The filed return is a self-assessment. TRA may later issue an adjusted assessment, payable within thirty days of the notice under section 65. PwC reports a five-year limit for TRA to adjust a return, with no limit for fraud or wilful neglect. A company that disputes an assessment objects within 30 days. The objection is admitted only after paying the greater of the tax not in dispute or one third of the assessed tax (register NEW-02-19, TAA s.62).

Disputes beyond objection go to the Tax Revenue Appeals Board and then the Tribunal, each with its own filing fees (NEW-02-20, NEW-02-21). An objection, an appeal, a prosecution or a seizure of assets needs an advocate. Zatra has an advocate on the team for those steps. Read our guides to appealing a TRA assessment and the deposit and to TRA tax audits and disputes.

What to do now

1. Fix the year-end date. Confirm the company's year of income on the TRA ledger and diary the six-month filing date.
2. Book the audit early. Agree a timetable with the CPA in public practice that ends at least a month before the filing date.
3. Reconcile instalments. Match each provisional payment and withholding certificate to the ledger before preparing the computation.
4. Prepare the computation. Adjust accounting profit for disallowed items, capital allowances, losses and the alternative minimum tax test.
5. Apply for an extension in time. If the audit will slip, apply in writing at least fifteen days before the due date.
6. Pay the balance on the due date. Generate the control number and pay by the filing date, even if the return itself is extended.
7. Plan the dividend decision. Decide on distributions within twelve months after year-end to manage the deemed distribution rule.
8. Keep the file for five years. Retain the return, accounts, computation and evidence, longer while an objection or audit is open.

Key dates and deadlines

• 1 July 2025: Finance Act 2025 in force: CPA rule for corporations above TZS 100 million gross income, alternative minimum tax at 1 percent, section 33A inserted.
• 9 February 2026: IDRAS goes live for domestic tax filing, as reported by PKF.
• 30 June 2026: return and balance due for years ended 31 December 2025.
• 1 July 2026: Finance Act 2026 in force: deemed distribution share cut to 15 percent.
• 30 September 2026: return due for years ended 31 March 2026.
• 31 December 2026: return due for years ended 30 June 2026; deemed distribution date for undistributed 2025 profits of December year-end companies.
• 30 June 2027: return and balance due for years ended 31 December 2026.
• 30 June 2027: end of the tea processing exclusion from the alternative minimum tax.

How Zatra helps

Zatra's tax and regulatory compliance team prepares the tax computation, reconciles instalments and withholding credits, and files the return in IDRAS. Our accounting and bookkeeping desk keeps the ledgers the auditor and TRA will ask for. The Finance & Tax Control package, USD 3,600 to 4,800 a year, covers the full annual cycle from estimate to return. A Senior Advisory Session at USD 49 suits a single question on a computation or an extension. Prices are on our pricing page.

Tax, penalties and interest are paid to TRA at the official amount against TRA's control number. They are separate from Zatra's professional fee and are never marked up. The schedule of official charges is in our government fees handbook.

TRA accepts the return, decides extensions and issues any assessment. Zatra prepares and coordinates the file; it does not decide or guarantee any authority's outcome.

Sources and status

Accurate as at 7 October 2026.

• The Income Tax Act, Cap. 332 R.E. 2023: published by TRA, revised edition 2023. Accessed 7 Oct 2026.
• The Income Tax Act, Chapter 332 R.E. 2023: Office of the Solicitor General e-library, item dated 1 Jul 2025. Accessed 7 Oct 2026.
• The Tax Administration Act, Cap. 438 R.E. 2023: published by TRA, revised edition 2023. Accessed 7 Oct 2026.
• The Tax Administration Act, Cap. 438 R.E. 2019: Ministry of Finance, 2019 revised edition. Accessed 7 Oct 2026.
• The Finance Act, 2025 (Act No. 11 of 2025): published by TRA, assented 30 Jun 2025, in force 1 Jul 2025. Accessed 7 Oct 2026.
• The Finance Act, 2026: published by TRA, assented 30 Jun 2026, in force 1 Jul 2026. Accessed 7 Oct 2026.
• Corporation Tax: Tanzania Revenue Authority, undated web page. Accessed 7 Oct 2026.
• Zanzibar Revenue Authority home page and taxes list: ZRA, undated. Accessed 7 Oct 2026.
• Tanzania, Corporate, Tax administration: PwC Worldwide Tax Summaries, last reviewed 9 Sep 2026. Accessed 7 Oct 2026.
• Tanzania Tax Guide 2025/26: RSM Tanzania, 2025. Accessed 7 Oct 2026.
• Tanzania Tax Update: Finance Act 2026 Highlights: Clyde & Co, 3 Jul 2026. Accessed 7 Oct 2026.
• All about Tanzania's new IDRAS: PKF Eastern Africa, January 2026. Accessed 7 Oct 2026.

Figures to confirm before you act

• Full text of ITA section 117(1): we confirmed the heading, the R.E. 2023 numbering and the 2025 amendment to subsection (3); the six-month deadline is from TRA's corporation tax page and PwC
• Return form codes: no current TRA list of income tax return form numbers was found on 7 October 2026; file the form IDRAS presents
• Nine-month deadline for public sector entities: reported by PwC only; confirm with TRA
• Interest in the worked example: an illustration at 8.75 percent (NEW-02-09); TRA's ledger computation governs, and the rate changes each quarter
• Deemed distribution timing: whether the 15 percent share applies to 2025 profits deemed distributed on 31 December 2026 depends on transitional reading of FA 2026 s.22; confirm with TRA
• Five-year limit on adjusting a return: reported by PwC; we did not read the section in the R.E. 2023 text
• Register lines F0196, F0198, F0202, NEW-02-05 to NEW-02-12, NEW-02-19: Zatra Handbook 06 register at 26 September 2026; the control number governs on the day of payment

This article is general information based on official sources available at the date of publication. It is not legal, tax or financial advice. Laws and notices change. Verify with the issuing authority or consult Zatra before acting.