The legal framework
Two instruments carry the weight. Section 33 of the Income Tax Act, Cap. 332 (R.E. 2023) is the charging provision: where associates transact, they must quantify, apportion and allocate amounts so that the resulting income or tax reflects what would have arisen at arm's length. Section 33(2) allows the Commissioner to make consistent adjustments where they have not, and in doing so to re-characterise the source and type of any income, loss or payment and to reallocate expenditure between the parties on a comparability analysis of their businesses. The operational detail sits in the Tax Administration (Transfer Pricing) Regulations 2018, gazetted as Government Notice No. 166 of 27 April 2018 — seventeen regulations in six parts, read together with section 33, which revoked the 2014 regulations. The Commissioner General's Transfer Pricing Guidelines, effective 1 July 2020 and issued under Regulation 16, supply the administrative gloss.
Administration belongs to the Tanzania Revenue Authority, through the Commissioner General and, for the groups that matter, the Large Taxpayers Department. Zanzibar maintains its own revenue authority for non-union taxes, but income tax and transfer pricing are TRA matters across the United Republic.
Two structural features surprise advisers arriving from elsewhere. First, Regulation 9 incorporates the OECD Transfer Pricing Guidelines and the UN Practical Manual as ambulatory interpretive sources, updated as they are updated — but the Regulations prevail on any inconsistency, and the Commissioner decides the most appropriate reading on matters the Regulations do not cover. That is a stronger domestic status than in many African jurisdictions, and a firmer subordination to local text. Second, the rules bite on wholly domestic controlled transactions, and Regulation 8 deems a branch and its headquarters person to be separate persons and associates. Tanzania is not an Inclusive Framework member and has no OECD country profile; the domestic text is the only text.
Methods, comparables and benchmarking
Tanzania has kept a method hierarchy that most jurisdictions have abandoned. Regulation 5(1) lists the five familiar methods plus a Commissioner-prescribed residual, but Regulation 5(2) requires traditional transaction methods to be applied first, Regulation 5(3) admits profit methods only where a traditional method cannot reliably be applied, and Regulation 5(4) reaches the residual only where neither works. Regulation 5(5) then layers a most appropriate method test over the hierarchy. The practical consequence is evidential: a file that selects TNMM without documenting why the CUP and resale price methods failed is defending the wrong point in an audit.
The range rules are the sharpest departure from OECD practice. Regulation 6(6) does not use the interquartile range. Where more than four comparables survive the search, the arm's length range runs from the thirty-fifth percentile to the sixtieth; where four or fewer are used, the arm's length result is simply the average. The gazetted text reads 'thirty fifth percentile and sixty of percentile' — a stray preposition inside 'sixtieth percentile' rather than an ambiguity — and the 2020 Guidelines state the same rule at paragraph 8.19 as the sixtieth percentile, so the 35th-to-65th figure that circulates in some commentary has no textual basis. Regulation 6(7) then requires any result outside the range to be adjusted to the median, although Guidelines paragraph 8.20 confines that to results which, by falling outside the range, erode the taxpayer's Tanzanian tax base. A band narrower than the interquartile range plus a median adjustment removes the cushion that taxpayers rely on elsewhere.
On comparables, Regulation 6(5) permits external data only where domestic data cannot be obtained — a preference rule rather than a bar on regional sets, but one that requires the file to show a Tanzanian search was run and failed. Regulation 6(3) requires same-year testing, so annual refreshes rather than three-year rolling studies, with an averaged fallback of no more than three prior years where current data is unavailable. Foreign tested parties are accepted only where the information is sufficient and verifiable, and the Guidelines set out the evidence expected. Loss-making related parties, and contract manufacturers in particular, carry an affirmative burden to show the loss is not a product of their controlled dealings.
Documentation: what the TRA expects
Regulation 7(1) imposes a contemporaneous documentation obligation on every participant in a controlled transaction, with no de minimis. 'Contemporaneous' is defined in Regulation 3 as brought into existence when the transaction is being developed or implemented — not reconstructed when the notice arrives. Regulation 7(2) prescribes eleven content heads, including the group and operational structure with shareholding percentages, industry and market conditions, transaction volumes and values, the pricing strategies and assumptions applied, the actual computational workings behind the prices, functional analysis, comparability analysis, method and tested party selection with supporting financial statements, and an index to the whole.
Tanzania has not adopted the Action 13 three-tier model. There is no master file, no separately defined local file with its own threshold, and no country-by-country reporting anywhere in Tanzanian law — not in the Regulations, not in the Tax Administration Act, and not in the Finance Acts of 2025 or 2026. What Regulation 7(2) requires is a single unified package that blends group-level and entity-level content. Advisers importing an OECD-shaped file will over-produce in some respects and under-produce in others.
The threshold that matters is TZS 10 billion of aggregate transactions with associates. At or above it, Regulation 7(3)(a) makes the documentation a filing obligation, lodged with the income tax return through ordinary e-filing. Below it, the documentation must still exist before the return filing date and must be produced within thirty days of a request. The Guidelines are unusually blunt that this thirty-day window is not extendable, on the reasoning that asking for more time is itself proof the file was never prepared — the response is a penalty procedure, not an accommodation. Documents must be held in Tanzania, in Kiswahili or English, for five years, extended while any objection, appeal, refund claim or audit remains open.
Audits, penalties and the enforcement climate
Transfer pricing is a declared TRA priority, and the review cycle is aggressive by regional standards: annual, or at times biennial, with field audits preferred to desk reviews. The sequence runs risk assessment, notification and entry meeting, information requests, field work, a draft findings report with a twenty-eight day response window, and final assessment. The recurring challenge themes are consistent across audit and litigation — the substance and benefit of intra-group services, IT and management fees; the characterisation and pricing of related-party financing; head-office and regional cost allocations to branches; and extractive-industry structures.
The penalty architecture is layered and, frankly, untidy. Regulation 7(4) sets a documentation penalty of not less than 3,500 currency points — a floor, not a cap, which the currency point increase to TZS 20,000 on 1 July 2024 lifted to TZS 70 million. Regulation 4(6) imposes a penalty of 100% of the adjusted amount for failing to price at arm's length. Running in parallel, section 90(2)(c) of the Tax Administration Act was amended in 2025 to add thirty percent of the adjusted loss, closing the gap where an adjustment merely eroded losses, and again in 2026 to make the penalty the greater of thirty percent of the adjustment or one hundred percent of the tax shortfall from 1 July 2026. Read literally the amended paragraph is now internally incoherent, and the relationship between Regulation 4(6) and section 90(2)(c) remains unresolved — both are arguable points in a well-run objection.
What matters commercially is that the penalty is no longer tethered to cash tax. A large adjustment against a marginally profitable or loss-making Tanzanian entity now carries real exposure. Relief is thin: a ten percent reduction for voluntary disclosure before discovery, a ten percent uplift for repeat application, and no documentation-based penalty protection of the kind found in most OECD member states. The assessment window is five years, unlimited where there is fraud, wilful neglect or serious omission.
The courts have hardened in step. In Amadeus Global Travel Distribution the Court of Appeal held in March 2026 that TNMM requires all costs attributable to the controlled activity in the cost base, rejecting the argument that operating margin inherently excludes finance costs. In Nyota Tanzania, decided in December 2025, intra-group IT charges failed for want of contemporaneous evidence of provision, benefit and pricing. Williamson Diamonds and the Aggreko permanent establishment line — including the December 2025 follow-on appeal on the same head-office and regional-hub allocations — make the same point on documented service charges and branch cost allocations, as does the earlier authority of Atlas Copco Tanzania and Alliance One Tobacco Tanzania.
Dispute resolution and advance certainty
The domestic route begins with an objection to the Commissioner General within thirty days of the tax decision, with grounds and supporting documents lodged at the time. The commercial obstacle is section 62(7) of the Tax Administration Act: the objection is not admitted unless the taxpayer pays the undisputed tax or one third of the assessment, whichever is greater, within the same thirty days. On a large transfer pricing assessment that is a significant cash call, and the waiver discretion should be engaged early rather than as an afterthought. If no determination issues within six months, the assessment is treated as final and the appeal clock starts. From there the route is the Tax Revenue Appeals Board, the Tribunal and the Court of Appeal. The Finance Act 2026 widened the amicable settlement window from sixty to ninety days once permission to settle is granted, with a further extension of up to thirty days — a meaningful change, because Tanzanian transfer pricing assessments have historically been resolved by negotiation more often than by judgment.
Cross-border relief is narrow and treaty-bound. Regulation 14(1) provides for corresponding adjustments only where the adjustment was made by the competent authority of a country with which Tanzania has a treaty; where the other country sits outside the treaty network there is no domestic route at all. Guidelines paragraph 17.3 sets the request window as one month from the date of the foreign adjustment or such time as the treaty allows for resolution by mutual agreement, so a treaty case keeps its usual presentation period — typically three years — but the one-month limb is the safer diary entry, and paragraph 17.4 lists what the request must contain. MAP itself exists only through Tanzania's nine treaties, most from the 1970s and 1980s, with three-year presentation windows and almost no arbitration. Domestic guidance is thin rather than absent — paragraphs 16.6 and 17.3 of the Guidelines are the whole of it — and outside the Inclusive Framework there is no Action 14 peer review and no published statistics.
Advance certainty is available in law and scarce in practice. Regulation 13 creates a proper APA regime — unilateral, bilateral or multilateral, up to five years of income, with no prescribed fee or threshold — and Regulation 13(7) confirms that covered transactions consistent with the agreement will not be adjusted. But Regulation 13(8) restricts the agreement to transactions entered into on or after its date, so there is no rollback despite what the superseded 2014 guidance suggested, and a compliance report is due with each year's return. No concluded Tanzanian APA has been publicly reported and the TRA has signalled capacity constraints. Treat the programme as an option to explore, not a plan to rely on.
Pillar Two, Amount B and what changes in 2026
Tanzania has enacted no part of Pillar Two. It is not a member of the OECD/G20 Inclusive Framework, so there is no income inclusion rule, no undertaxed profits rule and no qualified domestic minimum top-up tax; full-text searches of the Finance Acts 2025 and 2026 return nothing on GloBE, global minimum tax or top-up tax. The headline corporate rate stays at 30%. For in-scope groups the practical consequence runs the other way: Tanzanian profits fall to be tested under other jurisdictions' rules, and a Tanzanian transfer pricing adjustment or penalty can alter effective tax rate computations made elsewhere.
Amount B is equally absent. The simplified and streamlined approach operates through Inclusive Framework election and the covered-jurisdiction mechanism, and Tanzania is neither an electing jurisdiction nor one whose Amount B outcomes other members have committed to respect. Nor would it sit easily with domestic law: the traditional-method-first hierarchy in Regulation 5(2) and (3) is difficult to reconcile with a fixed return on sales for routine distributors, so a group applying Amount B upstream should expect to defend a conventional benchmarking study in Dar es Salaam.
What does change is enforcement capacity. From 1 July 2026 the arm's length penalty is measured against the adjustment, and section 73 of the Finance Act 2026 requires construction and extractive-industry entities to disclose their contractors and sub-contractors electronically within thirty days of executing a contract, with contract value, period, scope of works and expected withholding. That is a structured data feed into risk assessment in precisely the sectors where Tanzania litigates most.
How practitioners should respond
Three priorities. First, prepare to the Tanzanian template, not the OECD one: a single Regulation 7(2) package, built before the return date, with the computational workings actually shown. The thirty-day production window is unforgiving and cannot be met by a file that exists only in draft.
Second, build the service and financing evidence at the time of the transaction. Regulation 10 requires proof that services were rendered, conferred economic benefit and were charged at arm's length, and disregards shareholder, duplicative, on-call and incidental-benefit charges outright. That single provision explains most of the Tanzanian case law. Contracts, service descriptions, deliverables, allocation keys and evidence of benefit received should be assembled contemporaneously, and branch cost allocations should be documented as if the branch were a separate company, because Regulation 8 says it is.
Third, run the benchmarking on Tanzanian assumptions. Domestic search first, same-year data, annual refresh, foreign tested party only with fully verifiable information, and a result positioned with the 35th-to-60th band and the median adjustment in mind. Where an assessment does come, engage the one-third deposit question and the settlement window early, and test the penalty base — the overlap between Regulation 4(6) and the amended section 90(2)(c) is genuinely unsettled, and unsettled law is where cases are won.
