Personal Income Tax Return for Sole Traders (Inkomstdeklaration 1 with Bilaga NE)
The annual personal income tax return (Inkomstdeklaration 1) for individuals, including sole traders (enskild firma). Sole traders add Bilaga NE (sole trader supplement) and any applicable supplementary schedules including N3A (periodiseringsfond) and N3B (expansionsfond). The return covers all personal income sources.
Who this applies to
- All Swedish tax-resident individuals
- Sole traders (enskild firma) — must add Bilaga NE
- Individuals with rental income, capital gains, or investment income requiring supplementary schedules
- AB shareholders who received dividends — must file K10
What to file
Inkomstdeklaration 1 — the personal income tax return. Sole traders must attach: Bilaga NE (sole trader income calculation). Additionally as applicable: Bilaga N3A (periodiseringsfond), Bilaga N3B (expansionsfond), K10 (dividends from closely held AB), K4 (securities transactions).
How to file
Via Skatteverket's e-tjänster or mobile app using BankID. Most individuals receive a pre-filled return (förtryckt deklaration) and simply approve it. Sole traders add Bilaga NE themselves. Paper forms are available but digital filing is strongly preferred.
Payment due
Any remaining personal tax (kvarskatt) is due 90 days after the tax assessment. For early filers, this is typically September. Refunds (överskjutande skatt) are paid within a few weeks of assessment.
Penalties for missing this deadline
Förseningsavgift: SEK 1,250 for filing up to 3 months late; SEK 2,500 for 3-5 months late; SEK 3,750 for more than 5 months late. Skattetillägg (up to 40% surcharge) for deliberate underdeclaration.
Filing checklist
- Pre-filled personal income data reviewed and confirmed (salary, interest, dividends from Skatteverket's data)
- Bilaga NE completed for enskild firma net income (revenue minus deductible business expenses)
- Periodiseringsfond (Bilaga N3A): check if allocating new funds or reversing old ones
- Expansionsfond (Bilaga N3B): check current balance and any allocation or withdrawal
- K10 filed for AB shareholders who received dividends during the income year
- Travel deduction (reseavdrag) claimed if commuting more than 5km and savings exceed threshold
- Any other deductions (a-kassa, pension savings IPS) captured
Documents you'll need
- Bilaga NE completion data: revenue, deductible costs, depreciation, and net business profit from enskild firma
- Bank statements and bookkeeping records supporting the NE figures
- K10 form data if AB shareholder
- Supporting receipts for any significant deductions not pre-filled
Common mistakes to avoid
- Approving the pre-filled return without adding Bilaga NE (results in sole trader income being untaxed or incorrectly taxed)
- Forgetting to file K10 as an AB shareholder (even in years with no dividend — unused gränsbelopp is carried forward on K10)
- Missing the 2 May deadline — unlike the annual corporate return, personal returns have a firm early-May deadline with no general extension available
- Not claiming the reseavdrag (commuting deduction) where applicable — the threshold (SEK 11,000 annual saving) is achievable for many commuters
Never miss a Sweden deadline
AccountsOS tracks every Skatteverket (Swedish Tax Agency) and Bolagsverket (Swedish Companies Registration Office) deadline and reminds you weeks ahead.
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