TDS and TCS are where a large share of routine compliance mistakes actually happen, mostly because the rates, thresholds, and applicable sections vary by exactly what's being paid: salary under Section 192 works differently from rent or professional fees, which works differently again from a property purchase under Section 194-IA. This section breaks each payment type down on its own terms, alongside the quarterly return mechanics that report what's actually been deducted: Forms 138, 140 and 144 from FY 2026-27, and Forms 24Q, 26Q and 27Q for earlier years.
If you're the one deducting tax, the payment-specific guides here give you the current rate and threshold rather than one you might remember from a year or two ago, since several of these have shifted recently. If you're the one having tax deducted from you, reconciling what's actually landed in your Form 26AS and AIS against what should have been deducted, and knowing when a lower or nil deduction certificate under Section 197 is worth applying for, are usually the more useful starting points.