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Growth rebates (group and individual)

A growth rebate pays for doing more than a previous period, not for absolute turnover. The element's bands are growth percentages (e.g. "grow 5% → 1%, grow 10% → 2%"), and the level measured against them is how much turnover grew versus a configured comparison window — typically the same period last year.

Two variants:

  • Group growth — the whole group's growth percentage picks one band for everyone.
  • Individual growth — each member's own growth percentage picks their band independently.

How it calculates

  1. The element names a target window: a figures stream plus a date range holding the comparison turnover (for example last year's figures).
  2. Each period the engine computes the growth percentage: (current turnover − target window turnover) ÷ target window turnover × 100 — for the group as a whole (group growth) or per member (individual growth).
  3. Edge cases: nothing in the target window but turnover now → treated as +100% growth; turnover in the window but none now → −100%; no usable data on either side → 0%.
  4. The band whose from-figure is the highest one at or below the growth percentage is selected, and that rate is applied to the member's rebateable (output-stream) turnover as usual.

Example (individual growth). Bands: 0%+ → 0.5%, 5%+ → 1%, 10%+ → 2%. Member A did £110,000 this year against £100,000 in the target window — 10% growth — so earns 2% of their rebateable turnover. Member B did £102,000 against £100,000 — 2% growth — and earns 0.5%. A member with no turnover last year automatically hits the top band via the +100% rule, so new members can earn maximum growth rebate in their first year.

Why does a growth rebate change unexpectedly?

  • Turnover arriving in the comparison window's stream changes the denominator — last year's late figures can move this year's growth percentage without any current turnover changing.
  • The +100% / −100% edge rules kick in when either side of the comparison is empty, which can flip a member between the top band and nothing.
  • Group growth: another member's figures moved the group percentage — every member's rate changes together.

What a growth rebate is not

  • It is not a stepped rebate — the bands are percentages of growth, not absolute turnover values.
  • It does not pay on the growth amount — the selected rate is applied to the member's full rebateable turnover for the period, not just the increase.