How should I ask for salary hike if they are replacing my manager with me

Couple of things that you need to consider:

1. Why are they sacking your manager- if it’s to save costs, you’re not going to get same/similar salary
2. Understand what additional responsibilities you’ll inherit.
3. How important is this team/role foe business success. If the answer is yes, you can negotiate a salary hike. But most likely it will be a higher bonus and not fixed salary.
4. You might also set some goals with your new manager; if you achieve it, you get a mid-year raise. This is a good opportunity but also a lot of eyes will be on you.
5. You can also ask for things that can hell you in your role; eg. a paid course which will help you in your role.
6. A promotion usually comes with a raise, but in these cases they defer the raise for a year to see if you’re up to the role.

All the best.

It's simple, friend. Show them your worth, your contributions. Don't shy away from saying, 'Extra work, extra pay'. Be brave, be bold. Sabka time aata hai!

Maybe they are promoting you because they want someone to lead at your current salary. Better be prepared for that scenario as well

Have the talk, keep it casual.

You'll know, at least, if you should wait till June-July