| Book I, Title I: general rules of IBS and CBS | 1 to 83 | Scope, taxable event, place of the operation, calculation base, rates, settlement of the debt, credit, tax document, imports and exports. |
| Book I, Title II: special customs regimes, baggage and shipments | 84 to 111 | Treatment of IBS and CBS in special customs regimes and international shipments. |
| Book I, Title III: cashback and National Basic Basket | 112 to 125 | Refund to low-income families and zero rate for basket foods. |
| Book I, Title IV: differentiated regimes | 126 to 171 | 30% and 60% reductions, zero rate, public transport, rural producer, waste and used movable goods. |
| Book I, Title V: specific regimes | 172 to 307 | Fuels, financial services, health plans, prize draws, real estate, cooperatives, bars and hospitality, SAF. |
| Book I, Title VI: differentiated CBS regimes | 308 to 316 | CBS rules of its own, which do not apply to IBS. |
| Book I, Title VII: administration of IBS and CBS | 317 to 341-H | Regulation, harmonization, inspection, assessment by the tax authority, electronic domicile, presumptions and violations. |
| Book I, Title VIII: transition | 342 to 408 | Rates from 2026 to 2033, reference rates, government purchases, PIS and Cofins credit balance and capital goods. |
| Book II: Selective Tax | 409 to 438 | Scope, calculation base, taxpayers, specific rates updated by the IPCA inflation index and regulation by act of the Executive. |
| Book III, Title I: Manaus Free Zone and free trade areas | 439 to 471-F | Benefits, encouraged industry, presumed IBS credit on imports, refund to foreign tourists, compliance program and penalties for the split payment provider. |
| Book III, Titles II to IV: government purchases, transitional and final provisions | 472 to 544 | Allocation of the tax to the contracting entity, changes to other laws and the effective date of the law (art. 544). |