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I would like to create a web application for various companies to use in order to calculate weekyl or monthly payroll. The payroll rules are quite simple, gross pay and other "allowances" less deductions for National Insurance, Income Tax, accommodation etc. The system should create and print/email payslips and create an output file in an encrypted format which is sent to the authorities quarterly. I can define the database tables and provide sample pay slips, plus all of the rules for calculating deductions etc. There should be user log in for a multi-tenant system with strong protection so one user/company cannot see the data of another user/company. System to allow for 30 days trial and then request payment online annually. Payment gateway will initially be PayPal. Facility to reprint payslips, add/edit employees etc.