To determine the correct statements, let's analyze each one based on the information given in the context of Haryana's budget for the year 2026-27.

The first statement claims that, according to the Haryana Budget 2026-27, the maximum tax revenue comes from State Goods & Service Tax (SGST), followed by stamps and registration. To verify this, consider whether SGST is indeed the highest source of tax revenue and if stamps and registration follow. This information would typically be found in the official budget documents or a government press release.

Given that the correct answer is 2 only, this suggests that statement 1 must be incorrect. Possible reasons for this could be that there is another source generating more tax revenue than SGST or the sequence does not adhere to what is mentioned.

The second statement asserts that Haryana government's own tax revenue is projected to increase by 11% in the Budget 2026-27 relative to the Revised Budget 2025-26. This indicates an estimated increase based on projections typically outlined in the budget summary or related explanatory notes.

Since option 2 only is marked as the correct answer, statement 2 is accurate. This implies that the outlined growth rate of 11% is correct, as verified by budgetary forecasts.

Given these analyses:

• Statement 1 is incorrect as the sequence or amounts do not match the reality of the budget figures.
• Statement 2 is correct, confirming the estimated 11% increase in tax revenue.

Therefore, the correct option is 2 only.