Everything on the payslip: employer name and registration details, employee name and ID, pay period and payment date, each earning and deduction line, gross and net pay, and the bank account the pay went to. Figures stay in the original currency.
Payslips are dense with terms that have no neat UK equivalent: a Spanish 'paga extra', a German 'Weihnachtsgeld', a Polish 'składka zdrowotna', an Italian 'tredicesima' (a thirteenth month's salary, a concept the UK payroll world has never quite adopted). We translate each term accurately and, where the meaning isn't obvious to a UK reader, add a brief translator's note. That matters because caseworkers and underwriters need to tell basic pay from bonuses, allowances and one-off payments.
We don't convert currencies or pre-calculate an annual figure. UKVI applies its own exchange rate when it assesses the evidence, and lenders use their own; a translator's figure would only add a number that doesn't match. Decimal commas and local date formats are rendered consistently, with a note where the convention changes.