Discretionary trusts taxed at maximum marginal rate must have surcharge computed under slab and threshold rules, not automatically at top rate.
For private discretionary trusts taxed at the maximum marginal rate under sections 164/167B, the term denotes the highest basic slab rate under the Finance Act, but surcharge on that tax must be computed according to the Finance Act's slab- and threshold-based surcharge provisions; if the trust's total income does not cross the statutory surcharge threshold, no surcharge is leviable despite basic tax being at the top slab rate.