Indirect taxes — VAT, excise, customs — Public Finance Module 5

Indirect taxes — VAT, excise, customs — are the revenue workhorses of African economies. The narrow PAYE base means consumption taxes shoulder more of the revenue load than they do in OECD economies. Understanding the mechanics is the difference between treating VAT as 'a sales tax' (wrong) and seeing why it's the most-favoured consumption-tax instrument worldwide.

How VAT actually works

VAT is a destination-principle consumption tax collected fractionally through the production chain. Each registered business charges VAT on its outputs (output VAT), claims back the VAT paid on its inputs (input VAT), and remits the difference to the tax authority. The cumulative tax collected at every stage equals the VAT rate × the final consumer price — no more, no less, ignoring exemptions.

text

Stage           Sale price   Output VAT (16%)   Input VAT credit   Net VAT remitted
Farmer →        100          16                 0                  16
Miller →        200          32                 16                 16
Baker →         300          48                 32                 16
Retailer →      400          64                 48                 16
Consumer pays:               64 total VAT

Total VAT collected from the chain = 16 + 16 + 16 + 16 = 64
            = 16% × 400 (final consumer price)

Note that each business remits ONLY the value-added portion. No double-counting.

Why fractional collection is the genius of VAT

Every business in the chain has an incentive to demand a VAT-compliant invoice from its supplier — without it, they can't claim the input credit and they bear the tax themselves. This creates a paper trail and a self-enforcing mechanism. The Kenya eTIMS rollout exploits this: by requiring electronic tax invoices, KRA closes the gap between what businesses claim as inputs and what their suppliers report as outputs. Estimated VAT-gap reduction of 8-12 percentage points in compliance terms within 24 months of eTIMS rollout.

Zero-rating vs exemption vs standard-rating

Three treatments under VAT, all with different consequences:

Standard-rated (16% in Kenya) — output VAT charged at the full rate; input VAT fully creditable. The default treatment for most goods and services
Zero-rated (0%) — output VAT charged at zero; input VAT still fully creditable. The seller receives a refund or carry-forward. Net effect: the entire VAT chain is washed out for that good. Used for exports (to maintain export competitiveness — destination principle says exports are consumed in the importing country, so taxed there) and a small set of merit goods
Exempt — output VAT not charged; input VAT NOT creditable. Net effect: the seller absorbs the VAT on its inputs. The 'tax' is hidden in the seller's costs but is real. Used for financial services (because the value-added is hard to measure transaction-by-transaction), residential rent, education, healthcare in many systems

Exemption is NOT 'no VAT'

Most people read 'exempt' and assume the good carries no VAT cost. Wrong. Exemption means the seller can't reclaim input VAT, which lifts costs and is passed through to the buyer. Exemption is partial taxation; zero-rating is full untaxation. The reform pattern in most African countries is to MOVE exempt items to standard-rating (raising revenue and removing the hidden tax) while explicitly zero-rating only the items that genuinely deserve untaxation (basic medicines, certain food staples). The Kenya 2018 Finance Act zero-rated bread (later reversed) and various pharmaceuticals — those are full untaxations and revenue-significant.

VAT thresholds and the informal sector

Most VAT regimes have a registration threshold — businesses below it don't have to register, don't charge VAT, and can't claim input credits. Kenya's threshold is KES 5,000,000 annual turnover (revised upward in 2024 from KES 5 million in 2020). Below the threshold, you're treated as a final consumer of your inputs.

The threshold creates a Tinbergen-style trade-off: low threshold catches more economic activity (good for revenue and competitive neutrality) but creates massive compliance costs for small businesses that aren't equipped to maintain VAT books. High threshold loses revenue but reduces compliance burden on SMEs and the informal sector. Kenya's threshold has drifted upward as eTIMS reduces compliance costs of being registered — the optimal threshold falls as enforcement technology improves.

Excise taxes

Excise is a per-unit (or ad-valorem) tax on specific products, typically those with negative externalities, addiction characteristics, or high price-inelasticity of demand. Three economic roles:

Revenue — narrow base, high rate, but stable yield because excise items (alcohol, tobacco, fuel) have inelastic demand. Easy to administer and politically harder to evade than broad consumption taxes
Pigouvian correction — taxing negative externalities directly. Alcohol-related health costs, tobacco-related health costs, fuel-related carbon emissions and congestion. The optimal Pigouvian rate equals the marginal external cost; in practice, excise rates are often set well below estimated optimal Pigouvian rates
Distributional / merit — taxing luxury or 'sin' goods is politically popular because it falls on consumption choices that are seen as elective rather than necessity. Whether this is empirically true depends on the good — alcohol and tobacco consumption are strongly concentrated in lower-income groups in most African economies, making the distributional pattern less clear than the political framing suggests

Customs / trade taxes

Customs duties are taxes on imports. They're falling globally as a share of revenue (averaging 5-10% of total tax revenue in African economies, down from 25%+ in the 1980s) due to:

Trade liberalisation under WTO commitments
Regional trade arrangements — East African Community Common External Tariff harmonises rates across Kenya/Uganda/Tanzania/Rwanda/Burundi/SS
AfCFTA — the African Continental Free Trade Area target is full continental tariff liberalisation over 10-15 years from 2021. Most signatories are now in phase-down

The landed-cost calculation for a Kenyan importer:

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CIF (Cost + Insurance + Freight at Mombasa)         100,000
+ Import duty (e.g., 25% for finished goods)         25,000
  → Subtotal A                                       125,000
+ Excise duty (if applicable, e.g., 25% on vehicles)  31,250  (= 25% of A)
  → Subtotal B                                       156,250
+ VAT (16% of B)                                      25,000
  → Subtotal C                                       181,250
+ IDF (Import Declaration Fee, 2.5% of CIF)            2,500
+ RDL (Railway Development Levy, 2% of CIF)            2,000
  → Total landed cost                                185,750

Note the cascading — VAT is charged on the duty- and excise-inclusive
value, not on the CIF alone. This is intentional: VAT is a tax on the
final consumer-price value, and the duty/excise are part of that price.

Exercise

A Kenyan SME imports specialised manufacturing equipment with CIF value KES 5,000,000. The 2025 East African Common External Tariff classifies this equipment at 10% import duty. Standard VAT (16%) applies. There is no excise on this item. IDF is 2.5% of CIF and RDL is 2% of CIF. (1) Compute the total landed cost. (2) If the SME is VAT-registered and uses the equipment exclusively in its taxable-output business, what's the EFFECTIVE additional cost after VAT recovery? (3) If the SME is below the VAT threshold and not registered, what's the effective additional cost? (4) Comment on the policy distortion this creates between formal and informal businesses.