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Two-Weapon Fighting
If you wield a second weapon in your off hand, you can get one extra attack per round with that weapon. You suffer a –6 penalty with your regular attack or attacks with your primary hand and a –10 penalty to the attack with your off hand when you fight this way. You can reduce these penalties in two ways. First, if your off-hand weapon is light, the penalties are reduced by 2 each. An unarmed strike is always considered light. Second, the Two-Weapon Fighting feat lessens the primary hand penalty by 2, and the off-hand penalty by 6.
If you using TWF with two light weapons AND the feat Two Weapons Fighting you are at -2/-2 BEFORE adding BaB and strength modifier
What attack bonus does the extra attack from TWFing have?
Huh? I fail to follow the context of your question.
Barring natural attacks, if you choose to take an attack outside your normal full-attack routine, you will have to use your off-hand, and receive a penalty on both the complete attack routine from your main hand, and the additional attack using your off hand.
So (assuming a BAB of +12), your attack pattern was
+12/+7/+2 (plus any applicable modifier)
it becomes
+12-MainHandPenalty/+7-MainHandPenalty/+2-MainHandPenalty, plus +12-OffHandPenalty (with the secondary weapon) (again, all plus applicable modifiers)
Said penalties are:
-6 (MainhandPenalty) / -10 (OffhandPenalty) when just using two weapons
-4 (MainhandPenalty) / -8 (OffhandPenalty) when your secondary weapon is light
-4 (MainhandPenalty) / -4 (OffhandPenalty) when using two weapons and having the feat 'Two Weapon fighting'
-2 (MainhandPenalty) / -2 (OffhandPenalty) when your secondary weapon is light and you have the feat 'Two Weapon fighting'
Further feats down the chain effectively buy additional off-hand attacks, which are chained to the first off hand attack, at a cumulative -5. (While your primary attack chain grows longer automagically when your BAB rises, you'll actually have to buy feats to expand your secondary attack chain)
If you using TWF with two light weapons AND the feat Two Weapons Fighting you are at -2/-2 BEFORE adding BaB and strength modifier
Actually, there is no need for the primary weapon to be light. Fighting with Longsword and Dagger gets you into -2/-2 territory if you have TWF.
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@ Eridan
Those are modifiers. They have to be added to something.If you using TWF with two light weapons AND the feat Two Weapons Fighting you are at -2/-2 BEFORE adding BaB and strength modifierAnd what's the BaB of the extra attack?
@ Midnight_Angel
So that means that the extra attack uses BaB as its bonus to attack (plus all the modifiers)?
The BAB is as always, your base attack bonus. There is no other kind of BAB. Iterative attacks are, strictly, attacks with an increasing penalty. Multiple weapons follow the same rules.
So that means that the extra attack uses BaB as its bonus to attack (plus all the modifiers)?
Sure. Every attack in the system is based on your BAB, plus applicable modifiers.