---
title: "CIS gross up, net to gross"
method: POST
path: "/api/v1/gross-up"
tags: ["CIS"]
---

# CIS gross up, net to gross

`POST /api/v1/gross-up`

## Request

- Base URL: `https://0sand1s.co.uk`
- URL: `https://0sand1s.co.uk/api/v1/gross-up`
- Auth: none declared

Finds the gross amount (excluding VAT) that leaves a given net payment after the CIS deduction, for a subcontractor quoted a take-home figure. Takes the net, the subcontractor's materials and the rate (0, 20 or 30). Where rounding lets two grosses give the same net, the larger is returned so CIS is never under-deducted. Returns the forward working on that gross, money in pence and pounds. VAT is not included; add it on top if the subcontractor charges it. The same as the GET, with the input as a JSON body.

## Request body

- object
  - `net` string, required: The payment the subcontractor should receive after the CIS deduction, excluding VAT. Pounds, as a string like "1,200.00" or a number like 1200.
  - `materials` string: The subcontractor's materials within the payment, as for cis_deduction. Pounds, as a string like "1,200.00" or a number like 1200.
  - `rate` 0 | 20 | 30, required: The subcontractor's CIS rate in per cent: 20 if registered, 30 if not registered or unmatched when verified, 0 for gross payment status

## Response `200`

The answer

- ToolResponse
  - `tool` string, required
  - `result` object, required: The answer. Amounts are { pence, pounds } objects; dates are YYYY-MM-DD.
  - `summary` string, required: The answer in one line
  - `sources` object[], required
    - `title` string
    - `url` string, uri
  - `see_also` string, uri, required: The page on 0sand1s.co.uk that does the same sum or explains the rule

## Other responses

- `400`: Input that could not be used, with a message per field
- `429`: More than 60 requests in a minute from one address

---

[API](https://skmtc.dev/0sand1s/apis/0s-and-1s-cis-api.md) · [All operations](https://skmtc.dev/0sand1s/apis/0s-and-1s-cis-api/llms.txt) · [OpenAPI document](https://skmtc.dev/0sand1s/apis/0s-and-1s-cis-api/revisions/caf4279c7477?raw)