Vaud tax assessment: checks to carry out as soon as it arrives

Receiving a tax assessment is not merely about finding out how much tax will ultimately be due. The document establishes the taxable amounts accepted by the authority and starts an objection period that does not take a holiday.

An assessment may faithfully reflect the return filed, but it may also adjust income, reject a deduction, change an allocation between cantons or include an item submitted later. The final statement adds another layer: installments, payments, withholding tax and interest.

The right response is therefore to compare the documents methodically rather than look only at the amount payable at the bottom of the page.

Tax assessment and final statement: two separate checks

The assessment determines, in particular, taxable income and wealth for cantonal and communal taxes, and taxable income for direct federal tax. It may also show items relevant to determining the rate, even where they are not taxed in full in the canton.

The final statement then converts the assessment into a financial balance. In Vaud, the assessment and final statement are generally sent together. A balance owed to the State is normally payable within 30 days. Do not confuse the payment deadline with the objection deadline or leave the bill unattended while the objection is being considered.

The first check: protect the deadline immediately

1. Note the date of receipt. The period runs from notification, not simply from the date the document was opened at a corner of your desk. Keep the envelope, collection notice or evidence of electronic availability.
2. Read the appeal instructions. The final page identifies the competent authority, required form and objection deadline. Follow these instructions precisely.
3. Set an earlier internal deadline. A margin of several days allows time to gather supporting documents and send the objection before the last moment.
4. Send the complete file to your adviser. The assessment alone is insufficient. Include the filed return, receipt or summary notice, attachments, correspondence with the authority and final statement.

Checklist of items to compare

1. Identity, tax period and tax liability

Check the taxpayers concerned, tax year, marital status, address and municipality of taxation. Marriage, separation, divorce, death or a move may affect tax liability, the tax scale or allocation between cantons and municipalities.

2. Family circumstances

Check how children, shared custody, maintenance payments and dependants have been taken into account. Distinguish the deduction of the payment itself, social deductions and application of the tax scale or family quotient. A private agreement does not automatically produce every hoped-for tax effect: the authority will also examine actual payments and the specific circumstances.

3. Income

Compare wages, bonuses, allowances, self-employment income, pensions, insurance benefits, maintenance received, securities income and property income. For shareholdings, also check dividend treatment and any partial taxation.

Foreign income or income allocated to another canton may remain relevant to the rate. Its presence in the assessment therefore does not necessarily mean double taxation, but the allocation method must be checked.

4. Deductions

Identify differences in professional expenses, pension buy-ins, pillar 3a, childcare costs, maintenance paid, debt interest, medical expenses, donations, insurance premiums and property maintenance. A deduction may be rejected because it is capped, insufficiently documented, regarded as private or already included in a flat-rate allowance.

5. Wealth and debts

For cantonal and communal taxes, check accounts, securities, shareholdings, property, insurance policies with surrender values, business assets and other wealth. Also check accepted debts and their allocation. Tax values may differ from bank or accounting values; this is not necessarily a mistake, but it must be explainable.

6. Intercantonal or international allocation

Activity in several cantons, property outside the canton, arrival or departure during the year, and foreign income or assets may require an allocation. Check the period of tax liability, amounts assigned to each jurisdiction and items used only to determine the rate.

7. Tax calculation

Once the taxable bases have been verified, check that the calculation reflects the correct circumstances: cantonal and communal taxes, direct federal tax, the tax scale linked to family circumstances and the competent municipality. A difference from an estimate does not in itself establish an error; compare the same bases, tax period and parameters.

8. Installments, payments, withholding tax and interest

Reconcile the final statement with payments actually made. Installments, voluntary payments and creditable withholding tax must appear correctly. Check compensatory and late-payment interest separately, along with refund details if the balance is in your favor.

Example: a difference in taxable income does not explain everything

A taxpayer declared taxable income of CHF 82’000. The assessment uses CHF 90’000. The CHF 8’000 difference should not be challenged as a single block. Checking reveals that the authority reduced professional expenses by CHF 2’000 and rejected CHF 6’000 in childcare costs.

For professional expenses, the authority considers certain costs private. For childcare, it states that payment evidence is missing. A useful response addresses the two adjustments separately: explain the professional connection of the expenses, then provide the childcare contract, invoices and bank evidence.

Simply writing “I disagree with the amount” leaves the authority’s reasoning unanswered. A good objection identifies the item, specifies the requested amount and responds to the reason for rejection.

When does an adjustment justify an objection?

Before objecting, answer four questions:

1. Does the assessment actually differ from the return filed?
2. Is the adjustment explained in the assessment or an attachment?
3. Is the authority’s treatment legally debatable, or is a supporting document mainly missing?
4. What is the actual effect on income, wealth, the rate and the final tax?

The authority’s perspective must be taken seriously. It may argue, for example, that an expense is not sufficiently connected with earning income, that a document proves an invoice but not its payment, that a cost is private or that an amount exceeds the statutory cap. The objection must address this likely argument with supporting documents.

How to write a useful objection

For an ordinary assessment, the objection should contain at least:

• the name, taxpayer number and tax period;
• precise identification of the challenged assessment and its date;
• the requested amendments, item by item and quantified where possible;
• concise reasons addressing the authority’s adjustments;
• a list and copies of the supporting evidence;
• the date and signature of the taxpayer or representative.

Address the objection to the authority named in the appeal instructions. A method that proves the sending date, such as registered post, is prudent. The statutory 30-day period cannot be extended merely because documents are difficult to gather. If the deadline is approaching, immediately obtain advice on preserving your rights rather than assuming an informal message will suffice.

Estimated assessment: a substantially more demanding challenge

An assessment made by the authority on an estimated basis arises, in particular, where a return has not been filed despite the authority’s steps, or where the relevant facts cannot be established reliably. Vaud law permits it to be challenged only on the ground that it is manifestly incorrect. The objection must state its reasons and identify the evidence.

Simply asserting that the estimate seems too high is therefore insufficient. The correct tax figures must be reconstructed, missing information submitted and necessary supporting documents provided. An incomplete objection risks being inadmissible even if the assessment seems harsh. Waiting until the twenty-ninth day is a creative strategy here, but not in a good sense.

If the assessment is correct: close the file properly

An accepted assessment should be reconciled with the final statement and filed with the return, filing receipt, important supporting documents and payment evidence. Note the authority’s adjustments that should be carried forward next year: the tax value of a security, treatment of an expense or allocation of a property.

This avoids repeating a rejected position without explanation and makes the next assessment easier to check.

Frequently asked questions

Official sources

• Canton of Vaud — Paying my taxes: final statement, payment and form of objection
• Canton of Vaud — Tax returns and access to the tax file
• Vaud legislation — Cantonal Direct Taxes Act, BLV 642.11, in particular Articles 185–187
• Fedlex — Federal Direct Tax Act, in particular Articles 132–135
• Fedlex — Federal Act on the Harmonisation of Direct Taxes, in particular Articles 46–48

Last legal review: March 27, 2026.