As of my last knowledge update in September 2021, there are several tax declaration forms in Ethiopia to comply with the Federal Tax Laws. However, please note that tax regulations and forms may change over time, so it is always advisable to consult the latest information from the Ethiopian Revenue and Customs Authority (ERCA) or a tax professional. Here are some of the commonly known tax declaration forms in Ethiopia:

1. Form VAT 1: Value Added Tax (VAT) return form for businesses registered for VAT.
2. Form VAT 2: VAT withholding tax return form for businesses required to withhold VAT on payments made to suppliers.
3. Form VAT 3: VAT exemption certificate application form for businesses seeking exemption from VAT.
4. Form VAT 4: VAT refund application form for businesses claiming a refund of excess VAT paid.
5. Form TIN 1: Taxpayer Identification Number (TIN) registration form for individuals and businesses.
6. Form TIN 2: TIN update form for individuals and businesses to update their taxpayer information.
7. Form TIN 3: TIN cancellation form for individuals and businesses wishing to cancel their TIN registration.
8. Form WHT 1: Withholding tax return form for businesses required to withhold tax on certain payments.
9. Form WHT 2: Withholding tax exemption certificate application form for businesses seeking exemption from withholding tax.
10. Form WHT 3: Withholding tax refund application form for businesses claiming a refund of excess withholding tax.
11. Form CIT 1: Corporate Income Tax (CIT) return form for companies and other corporate entities.
12. Form PIT 1: Personal Income Tax (PIT) return form for individuals earning income subject to personal income tax.
13. Form ET 1: Excise Tax return form for businesses engaged in the production or importation of excisable goods.
14. Form ET 2: Excise Tax exemption certificate application form for businesses seeking exemption from excise tax.
15. Form ET 3: Excise Tax refund application form for businesses claiming a refund of excess excise tax paid.
16. Form SCT 1: Specific Business Tax (SCT) return form for businesses subject to specific business tax.
17. Form SCT 2: SCT exemption certificate application form for businesses seeking exemption from specific business tax.

Please note that this list may not be exhaustive, and there may be additional forms or updates to existing forms. It is recommended to consult the ERCA or a tax professional for the most up-to-date information on tax declaration forms in Ethiopia.