The Dutch tax year ends 31 December. The Indian FY ends 31 March. Returning Indians get caught in the gap if they don't plan the exit timing.

On the Dutch side, the Belastingdienst splits your departure year into a resident period (1 January to your departure date) and a non-resident period (departure date to 31 December). You file a 'migration return' (M-formulier) instead of the standard tax form. The resident period reports worldwide income; the non-resident period reports only Dutch-source income.

On the Indian side, the Income-tax Act's residence test under Section 6 applies. The 182-day rule (presence in India during the financial year) or the 60-day-plus-365-day rule (presence in India during the year combined with 365+ days in the preceding 4 years) determines residency for the full Indian FY. There's no split-year mechanism in Indian law — you're either resident for the FY or you're not.

The practical mismatch: if you leave the Netherlands in October 2025, your Dutch resident period covers 10 months (Jan-Oct 2025) and you become a Dutch non-resident from November 2025. Your Indian residency for FY 2025-26 (April 2025-March 2026) depends on your day-count — you'll likely be Indian resident for the year if you spend more than 182 days in India. But you spent more than 182 days in NL too, so you were Dutch resident for the calendar year.

This creates a 4-5 month overlap (November 2025 to March 2026) where the Netherlands no longer taxes you on worldwide income, but India already does. Both jurisdictions claim the same Indian-source income for FY 2025-26.

Box 3 in the Netherlands taxes your savings and investments at a deemed-return rate, currently computed under the post-2021 bridging law. In an emigration year, the asset valuation is fixed by the 1 January snapshot for the whole year — selling assets later (March, July, September) does not reduce the valuation used to compute the base, because the snapshot is already taken. The base and the heffingvrij vermogen (tax-free allowance) are not month-pro-rated. What gets time-apportioned is the Box 3 tax itself, attributed to the resident portion of the year via the M-form's double-tax-relief mechanics.

If you leave in October 2025, your Box 3 income for tax year 2025 is computed on your 1 January 2025 asset position, and the resulting tax is then attributed to your ~10 months of Dutch tax residency. The tax scales down compared with a full-year Dutch resident with the same starting holdings, but the base computation itself is unchanged.

The key optimisation is therefore: minimise your Box 3 base on 1 January of your departure year. The December-to-January window is when to consolidate, move Dutch savings into Box 1 or Box 2 categories where you have the structures, and reduce idle cash. Earlier emigration within the year helps too — the resident-period attribution lowers the tax payable — but the cleanest dollar saving comes from the 1 January snapshot. Note that the 30% ruling + partial non-resident election (under the pre-2024 regime) already shielded most non-Dutch assets from Box 3, so for engineers who used that election the cleanup is mostly around Dutch-domiciled assets.

AOW (Algemene Ouderdomswet) is the Dutch state pension. It accrues at 2% per year of Dutch residence between age 15 and the AOW retirement age (currently 67 and rising). The full accrual period is 50 years, so 50 × 2% = 100% of full AOW. Five years in NL = 10% of full AOW. Twenty years = 40%.

When you leave NL for India, the AOW accrual stops, but what you've accrued is preserved. The Dutch Sociale Verzekeringsbank (SVB) pays it out at AOW retirement age into a bank account in your country of residence — provided that country is on the SVB's qualifying list under the Wet beperking export uitkeringen (BEU Act). India is on that list and full AOW export to India is permitted. (If you're planning to retire in a third country, check the SVB list first — some non-EU destinations are excluded or restricted.) An Indian engineer who spent 10 years in NL retains 20% of full AOW, paid into their Indian bank account from age 67 onwards, in euros.

The India-side tax treatment: AOW is a state social-security pension under the India-Netherlands DTAA. Under Article 18(2), pensions paid in respect of past employment in the source state are typically taxable only in the source state. AOW arguably falls under the social-security pension provisions and may be taxable only in NL, or split between the two countries — the precise treatment depends on whether the income is characterised as a 'pension' for treaty purposes. Most Indian CAs report AOW as foreign income with treaty relief; some report it as exempt entirely. Get a position taken in writing from your CA before the first AOW payment lands.

The administrative requirement: keep your BSN (Burgerservicenummer, Dutch citizen service number) active and your SVB contact details current. AOW payments to a closed BSN go into limbo and recovery is slow.

Resident but Not Ordinarily Resident is the Indian transitional status that shields foreign-source income for up to 2-3 years after return. Eligibility: NRI in 9 of the 10 preceding years, OR fewer than 729 days in India in the preceding 7 years.

Most Dutch returners qualify easily. The RNOR window is your tax shelter for any tail income from your Dutch period — final salary payments, vested RSU residues that pay out in early 2026, severance, gardening leave, freelance Dutch income. While you're RNOR, those don't get taxed in India even though you're an Indian tax resident for the FY.

The alignment trick: structure your NL exit so the bulk of your taxable Dutch-source income lands during the RNOR window. If you leave in October 2025, your final NL payroll runs through October. December 2025 bonus, January 2026 RSU vest, February 2026 vacation-pay residue all land while you're RNOR for FY 2025-26 and FY 2026-27. India can't tax them; NL has limited reach because you're a Dutch non-resident after October.

The trap: if your Dutch employer extends your service contract through April 2026 to clear remaining vesting, you transition out of RNOR into full-resident-ordinary status mid-year. Now India taxes that April 2026 vest at slab rate as global income. The DTAA gives credit for any Dutch tax paid, but the Indian slab can exceed the Dutch effective rate (especially without the 30% ruling, which doesn't survive your residency change). Compute both scenarios before agreeing to extended Dutch service.

Deregister from your gemeente (municipality) in the window of 5 days before departure up to the day of departure itself. The municipality reports your departure to the Belastingdienst, SVB, and other Dutch authorities. If you've already left and missed this window, you can't deregister at the gemeente any more — you'll need to route the deregistration through the Dutch consulate from your new country, which is significantly slower. Without deregistration, you remain a 'Dutch resident' for civil-law purposes even after you've left — which interferes with the Dutch tax authority's recognition of your non-resident status and can keep you on the Box 3 hook.

Keep one Dutch bank account open if you can. Receiving AOW payments, residual tax refunds, or pension payouts is much smoother to a Dutch IBAN than to a forex conversion at an Indian bank. ABN AMRO and ING both allow non-resident maintenance of Dutch accounts; rabobank and SNS are stricter. Confirm before deregistering.

Maintain your DigiD (Dutch government digital ID) if possible. Even after leaving, you'll need it to access Belastingdienst correspondence, SVB pension updates, and any Dutch tax notices for the next 5-7 years. DigiD requires a Dutch address; some Dutch CAs offer address-of-record services for ~€100/year specifically for this purpose.

The 3-year window for re-establishing Dutch tax residence: under specific provisions, returning to NL within 3 years of departure can restore some tax positions (the 30% ruling becomes re-applicable in specific cases). If there's any chance you'll return, do not actively burn the bridges — keep the bank account, keep the DigiD, keep the BSN active.

Day -100 (T-100): Set the departure date. Notify your employer in writing. Begin RNOR eligibility check with an Indian CA who handles cross-border cases.

Day -90: Compute Box 3 base for the final year. Plan the December consolidation (move cash, restructure brokerage holdings).

Day -60: Confirm AOW accrual statement from SVB. Confirm any private pension entitlements. Document them for the Indian side.

Day -30: Notify your bank, broker, mortgage holder, utility providers. Set up forwarding addresses.

Day 0 (departure): Deregister at gemeente. Get departure confirmation. File the date with Belastingdienst.

Day +30 (arrival India): Notify Indian bank to convert resident accounts as required by FEMA. Begin NRE/NRO restructuring under the new resident status. Start the RNOR clock.

Day +90: First Indian quarterly self-assessment if applicable. Reconcile any tail Dutch income against RNOR shield.

Day +180: File migration return (M-formulier) for the Dutch side. Coordinate with your Indian CA for the cross-credit accounting.

Day +365: File first Indian ITR-2 as resident. Schedule FA disclosure for all foreign assets held. Form 67 for any Dutch tax paid on globally-reported income.

The departure is a 100-day project, not a 1-week move. Engineers who treat it as a logistics problem (movers, flight, school transfers) miss the tax-planning window and overpay six figures across the first two Indian years.