Without seeing your return and what the proposed IT-203 shows, I can say that NY bases the calculation of tax on your entire income for the year and applies the percentage of total income to NY income. NY then reduces the tax due based on that percentage. For instance, if your total income from all sources is $50,000 and your NY source income is $10,000, the percentage applied to the tax would be 20%. Then if the tax due on the total income is $2,700, the allocated tax would be $540.
If this is not what you are seeing, please make sure that you listed yourself as a part-year resident of NY and not a full-year resident and that the income applicable to your period of residency and the income from your period of non-residency is clearly listed. The checkmarks are often difficult to see.
@mcgraw-megan
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