What is TDS?
TDS (Tax Deducted at Source) is the mechanism where the payer — your employer, bank, tenant, or client — deducts tax before making a payment to you. Instead of you paying the full tax at year-end, the government collects it in instalments throughout the year.
Income is taxed before it reaches you — harder to hide.
Tax is collected monthly or at transaction time, not in one lump sum.
If TDS > actual liability, you claim a refund when filing ITR.
THE CORE RULE
TDS is not an extra tax. It is advance collection of your income tax. Your final liability is determined when you file ITR. TDS > liability → refund. TDS < liability → you pay the difference.