A new limited co. client is a CIS sub-contractor and has CIS deducted from invoices. He uses Xero payroll. The CIS functionality hasn’t been set up in Xero correctly and so the CIS suffered hasn't been sent as part of payroll submissions to HMRC. It has been simply been building up as a debtor on balance sheet. This goes back to April 2017.
What is the best way to correct this in Xero? The ‘Update CIS’ function only allows current and future months adjustments not historical adjustments. And on the EYU update function there is no CIS adjustment option
Thanks in advance.