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The schedule payments you should include in your ARR report would be the NPE paid from April - March of the financial year required and therefore you'd need to refer to your April - March schedules.

You'd need to declare your Net Pensionable Earnings (NPE) (your NPE income is your net GDS / PDS income paid up to the 31st March of each year), excluding Statement of Financial Entitlement (SFE) payments, trainers grant and any superannuable payments paid outside the Total Contract Value (TCV). These will be added on when the Year End figures are run and will be included on your SD86C.

All NHS dental contracts are paid the first working day of the month after they're being paid for, i.e. April would be paid the first working day in May, May would be paid in June etc.