We have verified on both TurboTax Online and TurboTax Download and all T4A(OAS) - Old Age Security have Taxable Pension Paid for Box 18. There is no box indicated for Lump Sum Payment. 

Please verify that you are in the T4A(OAS) and not the T4A - Pension, Retirement, Annuity, and Other Income where Box 18 is for Lump Sum Payment. 

Thank you for choosing TurboTax.

no that is not correct

Shis should be box 16

no that is not correct.

This is not correct , it was paid monthly.

T4A(OAS) was paid monthly

T4A(OAS) was paid monthly

T4A(OAS) was paid monthly

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Yes, you will enter the amount in box 18 just as it is on your T4A(OAS) slip.

Thank you for choosing TurboTax.