Typical sector situations, described as a pattern with no client identified. Each one shows what weighs on SAP and what changes when the design arrives ready and proven. The tax thesis stays with the client, never with the consultancy.
01Optical fiber in fixed assets
What weighs: Each network segment has its own date, cost and useful life, and statutory and tax depreciation do not move together.
What DFSpro changes: Parallel depreciation areas, reconciled by network class with the ledger.
Thousands of kilometers of cable, ducts and splices built from works and purchases over years. Relevant components are depreciated separately, the useful life is reviewed every year and the tax charge follows the rate on cost.
Basis: CPC 27, items 43, 44 and 51; Law 4.506/1964, art. 57; RIR, arts. 319 and 320.
Proof delivered: A report that closes cost and accumulated depreciation, statutory and tax, by class, and a scenario matrix that was run.
CIAP for a whole network
What weighs: Installments of 1/48 per month over thousands of entries, limited by the share of taxed outputs.
What DFSpro changes: A link between the entry invoice, the asset record and the CIAP, with a write-off test before the installments end.
The network comes from purchases in many establishments. The credit for each asset is taken only with support, and the asset record must show the month's installment and the balance.
Basis: LC 87/1996, art. 20, § 5; SINIEF Adjustment 02/09, clause one, § 3, VI.
Proof delivered: A statement by asset, with installments and balance, reconciled with the asset record and the delivered file.
Sale of used assets and revaluation
What weighs: To trade network segments, towers or equipment, you need the book value and the tax effect asset by asset.
What DFSpro changes: A record per asset with cost, depreciation, remaining CIAP and IBS and CBS base, simulated before the write-off.
Disposal takes the book value to profit or loss. The revalued model applies only if the law allows it, and the sale of used assets has its own rule in the reform, with the net acquisition value per asset.
Basis: CPC 27, items 31, 67 and 68; CPC 01, items 59 and 60; LC 87, art. 20, § 5; LC 214, art. 406.
Proof delivered: A record of each asset with the expected result of the write-off, checked against what the system posted.
Theft and loss of cable
What weighs: A field incident must reach fixed assets and tax with the same date and the same value.
What DFSpro changes: A flow from the incident to the write-off and the credit reversal, proven end to end.
Stolen cable or lost equipment no longer gives a future benefit, which calls for an accounting write-off. The ICMS credit is reversed and, in the reform, the reversal for fixed assets is proportional to useful life.
Basis: CPC 27, item 67; LC 87, art. 21, IV; LC 214, art. 47, §§ 6 and 7.
Proof delivered: A test case from the incident to the reversal, with evidence in the asset, the ledger and the tax file.
Expansion work in progress
What weighs: The accumulated cost becomes an asset only when the network goes into operation, and then depreciation and credit begin.
What DFSpro changes: A flow from the work to activation, with a partial activation test by segment.
Material, contractors and internal costs pile up before operation. Interest attributable to a qualifying asset is capitalized, and the activation date sets the first depreciation.
Basis: CPC 20, items 8, 9 and 17; CPC 27, item 8.
Proof delivered: A statement per work with accumulated cost, activation and first depreciation, reconciled with the ledger.
Right of use of fiber and capacity
What weighs: Long contracts for the assignment of fiber and capacity need accounting and invoicing tied together.
What DFSpro changes: A review of the contracts against the design of the asset and of billing, with renewal and termination scenarios.
A contract that transfers control of an identified asset is a lease and creates a right of use and a liability. The tax treatment of each revenue and expense is the client's decision.
Basis: CPC 06 (R2), items 9, 22 and 23.
Proof delivered: A matrix of contract, accounting treatment, tax document and entry.
Field subcontractors and withholding
What weighs: Hundreds of partner companies issue an invoice for each installation or maintenance order.
What DFSpro changes: Withholding calculated on the invoice, with a supplier and service master and a test by scenario.
The buyer of a service provided with assigned labor withholds eleven percent of the gross value and pays it on behalf of the provider. Choosing the classification of each service is up to the client.
Basis: Law 8.212/1991, art. 31.
Proof delivered: Invoice, withholding and file that close by supplier and period.
Fust and Funttel: calculation base
What weighs: The base is revenue with exclusions, and it closes only if cancellations, discounts and taxes are separated.
What DFSpro changes: A base report by period, reconciled with the ledger and invoices.
Fust is 1% of gross operating revenue, and Funttel is 0.5% of gross revenue, each with the exclusions of the law. The form and deadline of payment are outside this reading.
Basis: Law 9.998/2000, art. 6, IV; Law 10.052/2000, art. 4, III.
Proof delivered: A base statement by period, tied to the ledger.
Bill, invoice and ledger at scale
What weighs: Millions of invoices a month: the bill, the invoice and the ledger must close by charge type.
What DFSpro changes: A versioned history of the setup and a full reconciliation by period.
The agreement requires recording the information by the 5th day of the following month and keeping four files. For an old period, the file must be reproduced with the rule of the time.
Basis: ICMS Agreement 115/03, clauses two and four.
Proof delivered: Reproduction of an old period with the rule in force at the time, and a bill, invoice and ledger reconciliation.
Capital goods credit in the reform
What weighs: The 48-month CIAP now lives beside the immediate credit of the new tax, and each asset must say under which regime it was bought.
What DFSpro changes: Master data by regime and scenario testing, with the regulation followed in the AMS Fiscal.
The complementary law ensures full and immediate credit on the purchase of capital goods, taken separately and with a valid electronic document, and sets its own refund deadlines for fixed assets.
Basis: LC 214/2025, arts. 40, 47 and 108.
Proof delivered: A test load of assets with regime and expected credit, checked against the system result.
Migration of assets to S/4HANA
What weighs: The base has millions of records and several depreciation areas, and the balance must arrive reconciled.
What DFSpro changes: A load rehearsal and reconciliation by class and by area, with stabilization after the switch.
Cost and accumulated depreciation by area must be reconciled before and after the load, with no gap that contaminates the first close in the new system.
Basis: Migration method proposed by DFSpro, not yet run at a client.
Proof delivered: A reconciliation report by area, before and after, validated by the client.
Batch review of useful life
What weighs: A new technology may force a review of the useful life of whole classes at once.
What DFSpro changes: A simulation in a test environment, with before and after kept for audit.
A change in useful life is a change in accounting estimate, and anyone who adopts a tax rate different from the published one must prove it is adequate. The decision on the new useful life is the client's.
Basis: CPC 27, item 51; RIR, art. 320, § 1.
Proof delivered: A before and after comparison by class, with the trail of who approved.
The CIAP coefficient and the assignment of network means
What weighs: The share of the asset credit depends on classifying each revenue as taxed or not, and the assignment of network capacity between carriers causes disputes.
What DFSpro changes: Each revenue classified by service type in the tax master, with the coefficient recalculated and reconciled with the delivered file.
The CIAP coefficient is the ratio of taxed outputs to total outputs, and the asset credit is taken only in that proportion. In a 2025 decision, a state's tax appeals council upheld the penalty against a carrier that treated as taxed, in the coefficient, the revenue from the paid assignment of network means, even with deferral, and that did not remove exempt or untaxed revenue from the numerator. The decision applies to that state and shows where the discussion appears.
Basis: LC 87/1996, art. 20, § 5; Tax Appeals Council of Paraíba, Ruling 532/2025 (state decision, with no effect on other states).
Proof delivered: A statement of the coefficient month by month, with each revenue classified, and a scenario with taxed, deferred and exempt revenue.
CIAP outside its own block of the tax file
What weighs: Asset credit taken without the entry in the specific block of the digital bookkeeping may be treated as undue credit.
What DFSpro changes: A record-by-record check that every asset with credit appears in the CIAP block of the SPED Fiscal.
In a 2026 decision, a state's tax appeals council upheld the assessment of a carrier whose purchases of permanent assets had credit taken without being booked in the CIAP block of the digital bookkeeping. The CIAP is part of the digital bookkeeping, and in a network with thousands of assets the manual check does not scale.
Basis: SINIEF Adjustment 02/09, clause one, § 3, VI; Tax Appeals Council of Paraíba, Ruling 204/2026 (state decision).
Proof delivered: A report of assets with credit taken against assets booked in the block, with no gap, and a validated file.
Device lent to the customer
What weighs: A device bought by the carrier and lent to the customer stays in its assets and raises a question about the ICMS credit on the purchase.
What DFSpro changes: A lent device treated as an own asset, with the entry invoice, record and credit linked and reconciled.
Carriers buy devices and lend them out. The Supreme Court (STF), in Theme 1052, held that, within the limits of LC 87/1996, it is constitutional to take credit for ICMS charged on the entry of a mobile phone later lent by a mobile telephony provider. In SAP, the device must be in fixed assets, with the entry invoice linked to the record, and the control of quantity held by customers is large. The thesis covers mobile telephony, and applying it to a specific case is the client's decision.
Basis: STF, RE 1141756, Theme 1052 of general repercussion, judged in a virtual session in September 2020; LC 87/1996.
Proof delivered: A register of lent devices with invoice, asset record and credit calculated, reconciled with the ledger and the CIAP block.
Inspection fees per station
What weighs: Installation and operating fees are due per station, and the network grows every month.
What DFSpro changes: A station register tied to the asset record, to know which fee each station creates and when.
The installation fee is due when the license certificate for the operation of the stations is issued, and the operating fee is due every year for the inspection of the stations' operation. The law treats low-power base radio stations separately: below a certain power limit there is no charge, and in an intermediate range the installation fee is a fraction of the general rule. Each station must be classified by type and power, and the amount follows the table in the law.
Basis: Law 5.070/1966, art. 6, §§ 1 and 2, and §§ 4 to 6 of the same article for low-power stations (wording of Law 9.472/1997 and Law 13.097/2015).
Proof delivered: A report of stations by type and power, with the fee created and reconciled with the asset register and the paid slip.
Reversible assets and the sale of network assets
What weighs: For a carrier with a concession history, selling or encumbering a network segment requires knowing how much of the asset is reversible and how much is for private use.
What DFSpro changes: Each asset classified by use, with the share of use loaded in the master and tracked at write-off.
The law defines that, in calculating the economic value of adapting a concession to an authorization, reversible assets are the essential assets actually used in providing the conceded service, and that assets also used in other services under a private regime are valued in proportion to their use for the conceded service. In the sale of towers, ducts or fiber, each asset must carry this classification.
Basis: Law 9.472/1997, art. 144-C, added by Law 13.879/2019.
Proof delivered: A report per asset with use classification, share applied and asset record, before and after the write-off.
Refund of IBS and CBS on the bill
What weighs: In the supply of telecommunications, the refund to the benefited consumer is given at the time of billing, which brings the rule into billing.
What DFSpro changes: Billing tested with a benefited and a non-benefited consumer, and the tax document reconciled with the ledger.
LC 214/2025 orders refunds to be given at the time of billing in telecommunications supply and sets refund percentages, including one hundred percent of CBS and twenty percent of IBS in telecommunications supply operations. The exact timing and procedures depend on regulation, still to be followed.
Basis: LC 214/2025, art. 116, § 1, and art. 118, I.
Proof delivered: Bill scenarios with and without a refund, with the calculated value and the matching tax document.
Enablement and access provision outside ICMS
What weighs: Not every item on a telecom bill is a communication service taxed by ICMS.
What DFSpro changes: A service catalog with tax treatment per item, so the invoice and the assessment separate what is taxable.
The Superior Court of Justice (STJ) has one precedent excluding ICMS on the enablement of a mobile phone and another excluding ICMS on the service of internet access providers. On a bill with many items, the master must say which item goes to which treatment. How each state treats the item, and which thesis to follow, is up to the client.
Basis: STJ Precedents 334 and 350.
Proof delivered: A matrix of bill item by tax treatment, run with test invoices and checked against the assessment.