Is my company accounting correctly?

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Hi there. Need your independent advice please. I started working recently at a small business who do IT work and contracting for other businesses and invoice them monthly. My role is to send these invoices out, chase money, deal with some Ap, etc (a basic finance assistant role) while the main accounts are externally outsourced to the local accountants. 

 The companys YE was end of April and when sending all the invoices they did for that period to the accountants, my manager (the founder / MD) asked me to withhold all APril invoices and tell the accountants they did no IT work for that month. Instead, dividing the invoices across May, June and July and sayinh the work was done in those months. 
why would this be? Vat would still be the same as they are still recognising the invoices / income. But just not in the actual month.