Is the progress payment for construction work that extends to the month of January of the following year subject to withholding?

My company which does contract works signed a contract with its client between 11.10.2018-25.01.2019. Normally, the progress payments are subject to a withholding when they are extending to years. But we will finish the work in 2018. So, will the progress payments be subject to a withholding?

If the work ends on 31/12/2018, there won’t be a withholding.

Source :ISMMMO
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