TL;DR Always include taxes in the proposal. In a Simples Nacional (simplified regime) firm, ~6%. In Lucro Presumido (presumed-profit regime), ~13%. Include it inside the price (not as a separate line) and note in the footer that the "amount already accounts for applicable taxes".

The short answer

Yes, always. Forgetting tax is the most common mistake in an architect's proposal. In a typical Simples Nacional, you are leaving ~6% on the table. In Lucro Presumido, ~13%. On an R$ 80k project, that is R$ 5,000 to R$ 10,000 of lost margin.

How to include it

Do it like this:

  1. Calculate the subtotal (hours + direct costs + margin).
  2. Multiply by (1 + effective rate). E.g.: subtotal R$ 45,000 × 1.06 = R$ 47,700 (Simples).
  3. Present the final amount, without highlighting tax as a separate line.

How to communicate it

In the proposal footer or in the contract, write: "Amount includes taxes applicable to the firm's tax regime."

The client does not need to see it line by line. They need to know it is the full amount, with no surprises. If they ask, you explain.

Limify

Tax included automatically

Limify applies your tax regime to every proposal. You never forget, and the amount always comes out right.

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