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Methodology — Every Figure, Its Source

This page is the working behind every number on the site: the order the lines are added, how rounding works, where each figure comes from — and, just as prominently, the figures that are disputed and how we treat them.

The line order

Every bill is built in the order a printed bill builds it: energy charge → fixed charge → fuel charges adjustment → quarterly adjustment → FC surcharge → electricity duty → GST (18% of all the lines before it) → TV fee → section 235 advance tax (non-filers, bills of Rs 25,000 and above, 7.5% of the total including GST). Each line is rounded to two decimals before the next is added; the total is the sum of the rounded lines. This order was validated against a published, line-by-line validated bill example — energy Rs 9,930 plus fixed charge Rs 700, taxed at 18%, producing Rs 12,543.40 against the printed Rs 12,543 (PakHisaab's validated example, captured in our research) — and corroborated by an independent line-by-line bill reconstruction published for October 2026 bills.

The slab rule

Unprotected and lifeline consumers pay every unit at the rate of the band their total lands in; protected consumers price the first 100 units at Rs 10.54 and the remainder at Rs 13.01. This is not our interpretation: it is the tariff notification's own footnote — “only protected consumers will be allowed benefit of one previous slab; lifeline consumers will not be entitled to slab benefit.” Calculators that split unprotected bills into blocks produce visibly different (lower) numbers; we regard the footnote as decisive.

The source register

The contested register — what is disputed, and our treatment

Four figures in current Pakistani billing are genuinely disputed in print. We state our treatment on the calculators themselves and record the conflict here, rather than hiding it.

FC surcharge. Published sources range from Rs 3.23 (a Ministry of Energy levy table, where it appears alongside a Rs 0.43 component; the table's total reads Rs 0.43) to Rs 1.43 for protected consumers in a tracker's default. Our treatment: on, at Rs 0.43 — the smallest figure attested as an actual bill line — editable, exempt for lifeline, and labelled on every result. Electricity duty. K-Electric's own page publishes 1.5% of variable charges for domestic consumers, and bill-derived guides show it billed; some trackers treat it as removed since July 2025. Our treatment: on, at 1.5% of the energy, fixed, FCA, QTA and FC lines; off on the TESCO page after a report that TESCO did not levy it for FY2025-26. TV fee. Rs 35 is widely documented, but two independent line-by-line bill reconstructions omit it entirely. Our treatment: off by default, one tap to add. K-Electric TOU off-peak rate. Direct published readings conflict — Rs 34.53 (the figure in the standard tariff table for the other companies) versus Rs 40.53 in two KE-focused bill trackers — and the tariff annex on K-Electric's site is an image document we could not read reliably. Our treatment: no TOU mode for K-Electric until the annex is read; the gap is disclosed on the K-Electric page itself. December QTA. Requested (+Rs 1.34) but not decided (hearing 17 November 2026) — nowhere on this site is a request printed as a rate.

Two corrections from our own specification audit are also recorded here, because a site about correct bills should correct itself in public: our initial worked examples for a 250-unit net-billing case and a 320-unit solar case had mis-banded the underlying energy charges (101 – 200 and 201 – 300 rates applied to the wrong totals). The corrected figures — Rs 11,442.08 for the 250-unit bill and Rs 12,614.82 payable for the 320-import case — are the ones the calculators produce and the pages show.

The verification protocol

Every worked figure printed on this site is produced by the same calculation the tools run, and the site's check suite re-derives each printed anchor before any release — a page cannot ship a number the calculation does not produce. FCA and QTA defaults are replaced within days of each NEPRA decision, never on a request or a forecast. Figures we could not verify are labelled as ranges, estimates or unverified, in those words. If your printed bill disagrees with a figure here, the bill governs — and the contact page is where to tell us; corrections are logged on this page.