Core assumptions on this site are reviewed against GOV.UK and other official UK public-sector guidance.
For the current build we reviewed official pages covering Universal Credit, Child Benefit, the High Income Child Benefit Charge, Pension Credit, PIP, Housing Benefit, Council Tax Reduction, SSP, maternity payments, ESA, JSA, Tax-Free Childcare, Sure Start Maternity Grant, Healthy Start, Free School Meals, Winter Fuel Payment and Cold Weather Payments.
Where a calculation is simplified, that is stated on the page itself.