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Starting at 2nd level, you can add half your proficiency bonus, rounded down, to any ability check you make that doesn't already include your proficiency bonus.

I could at level 2 add half my proficiency (being 1) to for example Deception making that skill go from 5+1=6.

Now at level 3 I get to add proficiencies and decide that Deception should now be something I am proficient in.

The way I interpret this is that I could keep the 6 and add the 2 from the proficiency because at the time of adding (Jack Of All Trades) I hadn't been proficient in it.

So I'm just asking for clarification.

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  • \$\begingroup\$ I just realised that the misunderstanding here was my fault - sorry about that! \$\endgroup\$ – Miniman Dec 1 '15 at 4:57
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You cannot gain the bonus from both Jack of all Trades and Proficiency, they are mutually exclusive.

You're misunderstanding the way ability checks work. An ability check is:

To make an ability check, roll a d20 and add the relevant ability modifier. As with other d20 rolls, apply bonuses and penalties, and compare the total to the DC.

The number you have written on your character sheet is not your ability check. It merely represents the combination of your ability modifier and the bonuses and penalties that will generally apply when you make a check of that type.

So when you make a Deception check, you add the relevant ability modifier (Cha), then any bonuses or penalties that apply. If you're proficient in Deception, one of those bonuses is your proficiency bonus. However, the check now includes your proficiency bonus, to Jack of All Trades no longer applies.

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  • \$\begingroup\$ Minor comment, but in most cases Deception should be using Cha, not Dex. \$\endgroup\$ – Ethan Dec 1 '15 at 20:40
  • \$\begingroup\$ @Ethan Yikes, that's embarassing. Thanks for picking that up! \$\endgroup\$ – Miniman Dec 1 '15 at 22:43
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You calculate your total bonus to each check when you are asked to roll. Prefilling the numbers on the sheet is only a convenience thing.

So when you take proficiency, the next time you are required to roll a check, you need to calculate your bonus and you won't be able to add Jack of All Trades anymore, since you added your proficiency bonus.

Check the language for rolling checks; it always says something like "Roll 1d20 and add these modifiers", it never says "Roll 1d20 plus whatever it says on your sheet". The sheet is just to save you a lot of time during the game.

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