diff --git a/beacon-chain/core/epoch/precompute/BUILD.bazel b/beacon-chain/core/epoch/precompute/BUILD.bazel
new file mode 100644
index 000000000..01b50f9e9
--- /dev/null
+++ b/beacon-chain/core/epoch/precompute/BUILD.bazel
@@ -0,0 +1,8 @@
+load("@io_bazel_rules_go//go:def.bzl", "go_library")
+
+go_library(
+    name = "go_default_library",
+    srcs = ["type.go"],
+    importpath = "github.com/prysmaticlabs/prysm/beacon-chain/core/epoch/precompute",
+    visibility = ["//beacon-chain:__subpackages__"],
+)
diff --git a/beacon-chain/core/epoch/precompute/type.go b/beacon-chain/core/epoch/precompute/type.go
new file mode 100644
index 000000000..c9712a7a9
--- /dev/null
+++ b/beacon-chain/core/epoch/precompute/type.go
@@ -0,0 +1,54 @@
+package precompute
+
+// Validator stores the pre computation of individual validator's attesting records these records
+// consist of attestation votes, block inclusion record. Pre computing and storing such record
+// is essential for process epoch optimizations.
+type Validator struct {
+	// IsSlashed is true if the validator has been slashed.
+	IsSlashed bool
+	// IsWithdrawableCurrentEpoch is true if the validator can withdraw current epoch.
+	IsWithdrawableCurrentEpoch bool
+	// IsActiveCurrentEpoch is true if the validator was active current epoch.
+	IsActiveCurrentEpoch bool
+	// IsActivePrevEpoch is true if the validator was active prev epoch.
+	IsActivePrevEpoch bool
+	// IsCurrentEpochAttester is true if the validator attested current epoch.
+	IsCurrentEpochAttester bool
+	// IsCurrentEpochTargetAttester is true if the validator attested current epoch target.
+	IsCurrentEpochTargetAttester bool
+	// IsPrevEpochAttester is true if the validator attested previous epoch.
+	IsPrevEpochAttester bool
+	// IsPrevEpochTargetAttester is true if the validator attested previous epoch target.
+	IsPrevEpochTargetAttester bool
+	// IsHeadAttester is true if the validator attested head.
+	IsPrevEpochHeadAttester bool
+
+	// CurrentEpochEffectiveBalance is how much effective balance this validator validator has current epoch.
+	CurrentEpochEffectiveBalance uint64
+	// InclusionDistance is the distance between the assigned slot and this validator's attestation was included in block.
+	InclusionDistance uint64
+	// ProposerIndex is the index of proposer at slot where this validator's attestation was included.
+	ProposerIndex uint64
+}
+
+// Balance stores the pre computation of the total participated balances for a given epoch
+// Pre computing and storing such record is essential for process epoch optimizations.
+type Balance struct {
+	// CurrentEpoch is the total effective balance of all active validators during current epoch.
+	CurrentEpoch uint64
+	// PrevEpoch is the total effective balance of all active validators during prev epoch.
+	PrevEpoch uint64
+	// CurrentEpochAttesters is the total effective balance of all validators who attested during current epoch.
+	CurrentEpochAttesters uint64
+	// CurrentEpochTargetAttesters is the total effective balance of all validators who attested
+	// for epoch boundary block during current epoch.
+	CurrentEpochTargetAttesters uint64
+	// PrevEpochAttesters is the total effective balance of all validators who attested during prev epoch.
+	PrevEpochAttesters uint64
+	// PrevEpochTargetAttesters is the total effective balance of all validators who attested
+	// for epoch boundary block during prev epoch.
+	PrevEpochTargetAttesters uint64
+	// PrevEpochHeadAttesters is the total effective balance of all validators who attested
+	// correctly for head block during prev epoch.
+	PrevEpochHeadAttesters uint64
+}