https://www.thelocal.es/20251127/calendar-the-tax-deadlines-in-spain-in-2026
Residents, non-residents, salaried workers, the self-employed, landlords, retirees - there are various tax deadlines throughout the year that you need to be...
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https://www.livemint.com/money/personal-finance/your-2026-financial-calendar-key-dates-deadlines-and-decisions-that-will-shape-your-finances-11767085400522.html
Jan 1, 2026 - Throughout the year, there are key financial actions and deadlines that can make a real difference to your tax savings, compliance, investments, travel plans...
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https://www.aarp.org/money/taxes/irs-tax-deadlines/
Is Tax Day April 15 this year? When are estimated taxes due? Our federal filing calendar has the answers
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