Get CPI and SPI, then the three standard forecasts they produce, so you can see how much the answer depends on which assumption you make.
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CPI = EV / AC. SPI = EV / PV. The three forecasts are EAC = AC + (BAC - EV) when the overrun was a one-off, EAC = BAC / CPI when current performance continues, and EAC = AC + (BAC - EV) / (CPI x SPI) when schedule recovery will cost money too.
BAC / CPI unless you can name the specific thing that caused the overrun and explain why it cannot recur. That is the default because cost performance is stubbornly stable: a project rarely gets cheaper per unit of work as it goes on.
You are spending efficiently on the work you are doing, but not doing enough of it. Usually that is a resourcing or dependency problem rather than a cost problem, and adding budget will not fix it.
Because at completion earned value equals planned value by definition, so SPI returns to 1 even on a project that finished late. Late in a project, trust the critical path over SPI.
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