kono keikaku no tame ni sikin ga hituyou desu.

A word-by-word breakdown is:

• この = this
• 計画 = plan
• のために = for, for the sake of
• 資金 = funds, financing
• が = marks the thing that is needed
• 必要です = is necessary / is needed

So the structure is basically:

This plan + for + funds + are needed

A more natural English rendering is Funds are needed for this plan.

この means this and directly modifies the noun 計画.

So:

• 計画 = plan
• この計画 = this plan

Japanese demonstratives like この / その / あの always come before a noun:

• この計画 = this plan
• その計画 = that plan
• あの計画 = that plan over there

If you wanted to say this is the plan, you would use これ instead, but これ cannot directly modify a noun.

Because ため is a noun-like word, and when a noun comes before it, you usually connect them with の.

So:

• 計画のために = for the plan / for the sake of the plan

This is the normal pattern:

• noun + のために

Examples:

• 家族のために = for the family
• 会社のために = for the company
• この計画のために = for this plan

By contrast, with a verb dictionary form, you do not use の:

• 成功するために = in order to succeed

Here, ために means for or for the sake of.

So この計画のために means for this plan.

Be aware that ために can also sometimes mean because of, depending on context:

• 台風のために中止になった = It was canceled because of the typhoon.

In your sentence, though, the meaning is clearly for this plan, not because of this plan.

Because 必要 does not work like a normal transitive verb.

必要 is a na-adjective (and also noun-like in some uses), so the thing that is necessary is commonly marked with が:

• お金が必要です = Money is necessary / I need money
• 時間が必要です = Time is necessary / I need time
• 資金が必要です = Funds are necessary / Funds are needed

Using を必要です is incorrect.

You may also see 必要とする, which is a verb expression:

• 資金を必要としている = is requiring funds / needs funds

But in your sentence, 資金が必要です is the standard pattern.

Yes, 必要 is a na-adjective.

Na-adjectives use な only when they come directly before a noun:

• 必要な資金 = necessary funds

But when they come at the end of the sentence, they do not use な:

• 資金が必要です = Funds are necessary

So:

• 必要な + noun
• noun + が必要です

That is why 必要です is correct here.

資金 is more formal and specific than お金.

• お金 = money in a general sense
• 資金 = funds, capital, financing

Because the sentence is about a plan, 資金 sounds more natural in a business, project, or official context.

Compare:

• この計画のためにお金が必要です = We need money for this plan
  → understandable, but more general and less formal

• この計画のために資金が必要です = Funds are needed for this plan
  → more formal, more like project/business language

Japanese often leaves out the subject when it is clear from context or not important.

So この計画のために資金が必要です does not explicitly say:

• who needs the funds
• whose plan it is
• whether I, we, or they are involved

It simply states that funds are needed for this plan.

Depending on context, it could imply:

• We need funds for this plan
• Funds are necessary for this plan
• This plan requires funding

Japanese often focuses more on the situation than on explicitly naming the subject.

Yes, but it changes the nuance.

• 資金が必要です = funds are needed
  → neutral statement, presenting funds as the thing that is needed

• 資金は必要です = as for funds, they are needed
  → more contrastive or topical, as if comparing funds with other things

For example, は might suggest something like:

• Maybe staff are not needed, but funds are.
• At least funds are necessary.

So が is the most natural choice for a plain statement of need.

It is read:

この けいかく の ため に しきん が ひつよう です。

Without spacing, which is how Japanese is normally written:

この計画のために資金が必要です。

Key readings:

• 計画 = けいかく
• 資金 = しきん
• 必要 = ひつよう

Japanese normally does not use spaces between words.

So the standard written form is:

この計画のために資金が必要です。

Spaces are often added only in beginner materials to make the sentence easier to read and to help learners identify word boundaries.

So the spaced version is for learning purposes, not normal Japanese writing.