With these segment dynamics, we would expect IBM’s operating pre-tax margin to expand by about a half a point – that’s in line with our model. And our tax rate should be in the mid-to-high-teens range.
Let me comment on a few items within our expectations. First, as I said, currency was a significant headwind in 2022, impacting revenue by three-and-a-half billion dollars. With the movement of spot rates over the last 90 days, currency translation would be fairly neutral to revenue in 2023, with a headwind in the first half flipping to a tailwind in the second. But, I’ll remind you that we had over $650 million of hedging gains in 2022 which will not repeat in 2023, resulting in an impact to our profit and cash on a year to year basis.
Second, as you know we have taken a number of significant portfolio actions over the last couple of years, which has resulted in some stranded costs in our business. We expect to address these remaining stranded costs early in the year and anticipate a charge of about $300 million in the first quarter. We would start to see benefits in the second half and pay back by the end of the year.
And then third, we regularly review the useful lives of our assets. Due to advances in technology, we are making an accounting change to extend the useful life of our server and networking equipment, effective the first of January. Based on our year-end asset base, we expect this change to benefit 2023 pre-tax profit by over $200 million, primarily in our Infrastructure segment. Given this is a change to depreciation, there’s no benefit to cash.
Looking at the first quarter, our constant currency revenue growth should be fairly consistent with the full year. Reported growth will also include about a three point currency headwind at current spot rates. With